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Questions and Answers

What is a key advantage of external fertilization in vertebrates?

  • It requires no specific environmental conditions
  • It leads to a higher likelihood of successful fertilization
  • It produces a large number of offspring (correct)
  • It protects the eggs from desiccation

Which group of animals commonly uses external fertilization?

  • Birds
  • Mammals
  • Reptiles
  • Fish (correct)

What is a significant advantage of internal fertilization in vertebrates?

  • It provides a higher likelihood of successful fertilization (correct)
  • It produces a large number of offspring
  • It requires a watery environment
  • It allows the release of eggs and sperm into the water

Why does external fertilization require specific environmental conditions?

<p>To facilitate the process of fertilization in water (D)</p> Signup and view all the answers

Which aspect of reproductive strategies influences the evolutionary biology of vertebrates?

<p>The success rate of fertilization (A)</p> Signup and view all the answers

Where does sperm mature and get stored after being produced in the testes?

<p>Epididymis (D)</p> Signup and view all the answers

Which gland produces a nutrient-rich fluid that provides energy for sperm cells?

<p>Seminal Vesicles (C)</p> Signup and view all the answers

What is the primary function of the Cowper’s Gland (Bulbourethral Gland) in the male reproductive system?

<p>Neutralize acidic urine traces in the urethra (C)</p> Signup and view all the answers

What is the main role of the Fallopian Tubes in the female reproductive system?

<p>Transport egg cells from the ovary to the uterus (A)</p> Signup and view all the answers

What is the function of the Endometrium in the female reproductive system?

<p>Houses and protects the embryo (D)</p> Signup and view all the answers

What hormone is primarily responsible for driving spermatogenesis in males?

<p>Testosterone (D)</p> Signup and view all the answers

Which part of a sperm cell contains the genetic material and an acrosome?

<p>Head (B)</p> Signup and view all the answers

In females, what stimulates the enlargement of one cell within a follicle each cycle?

<p>Follicle-stimulating hormone (D)</p> Signup and view all the answers

During the menstrual cycle, what happens during days 1-7 in the ovaries?

<p>Secretion of oestrogen (C)</p> Signup and view all the answers

What is the primary function of the acrosome in a sperm cell?

<p>Penetrating the egg (B)</p> Signup and view all the answers

Which reproductive mode offers the advantage of allowing parents to produce many offspring simultaneously?

<p>Ovipary (A)</p> Signup and view all the answers

Which developmental strategy results in offspring that are born with their eyes open, covered in down or fur, and can stand shortly after birth?

<p>Precocial (A)</p> Signup and view all the answers

Which animals retain eggs within the mother's body until they are ready to hatch?

<p>Some reptiles (C)</p> Signup and view all the answers

Which evolutionary advancement provides a self-contained aquatic environment for the developing embryo, protecting it from dehydration and physical harm?

<p>Amniotic egg (B)</p> Signup and view all the answers

Which type of parental care involves nest building, egg guarding, feeding, and teaching activities to increase the survival rates of the young?

<p>Extensive parental care (C)</p> Signup and view all the answers

What hormone stimulates the development of the follicle in the ovaries?

<p>Follicle-Stimulating Hormone (FSH) (A)</p> Signup and view all the answers

During which phase of the menstrual cycle does ovulation occur?

<p>Follicular Phase (B)</p> Signup and view all the answers

When does the corpus luteum stop producing progesterone?

<p>During Menstruation (B)</p> Signup and view all the answers

What is the name of the fluid-filled ball of cells that forms typically around five days after fertilization?

<p>Blastocyst (B)</p> Signup and view all the answers

Which hormone is secreted by the placenta and contributes to maintaining pregnancy?

<p>Progesterone (A)</p> Signup and view all the answers

When does the embryo become known as a fetus?

<p>After 8 weeks (A)</p> Signup and view all the answers

What is the function of the umbilical vein in the umbilical cord?

<p>Carrying oxygenated blood from the embryo to the placenta (D)</p> Signup and view all the answers

What is the main function of effectors in the nervous system?

<p>Responding to stimuli (B)</p> Signup and view all the answers

Which system is responsible for regulating involuntary bodily functions?

<p>Autonomic nervous system (A)</p> Signup and view all the answers

What do grey matter and white matter refer to in the nervous system?

<p>Different parts of the spinal cord (A)</p> Signup and view all the answers

What is the primary responsibility of the cerebrum?

<p>Interpreting sensations and enabling perception (A)</p> Signup and view all the answers

Which part of the brain helps maintain balance and muscle tension?

<p>Cerebellum (B)</p> Signup and view all the answers

Which component of the central nervous system controls involuntary actions like the heartbeat?

<p>Medulla Oblongata (B)</p> Signup and view all the answers

What is the role of sensory (afferent) neurons in the nervous system?

<p>Detect stimuli and transmit impulses to the brain (C)</p> Signup and view all the answers

Which part of the peripheral nervous system manages involuntary functions like digestion?

<p>Autonomic Nervous System (C)</p> Signup and view all the answers

What is the main function of the autonomic nervous system?

<p>Maintain balance by controlling involuntary actions (D)</p> Signup and view all the answers

Which branch of the autonomic nervous system prepares the body for 'fight or flight' situations?

<p>Sympathetic Nervous System (B)</p> Signup and view all the answers

What is the function of motor neurons in the nervous system?

<p>Respond to stimuli by transmitting impulses from the brain to effectors (A)</p> Signup and view all the answers

What is the role of interneurons in the nervous system?

<p>Process information and determine appropriate responses (A)</p> Signup and view all the answers

Which part of a neuron covers the axon, speeds up electrical transmission, and provides insulation?

<p>Myelin Sheath (D)</p> Signup and view all the answers

What is the primary hormone driving female puberty?

<p>Oestrogen (B)</p> Signup and view all the answers

What is the primary process involved in female gamete production?

<p>Meiosis (B)</p> Signup and view all the answers

Which male sex hormone is primarily responsible for driving spermatogenesis?

<p>Testosterone (B)</p> Signup and view all the answers

What is the primary function of the acrosome in a sperm cell?

<p>Enzyme release for fertilization (B)</p> Signup and view all the answers

What marks the physical maturity in females during puberty?

<p>Development of hips (A)</p> Signup and view all the answers

What is a key advantage of internal fertilization in vertebrates?

<p>It leads to successful fertilization due to sperm meeting egg more efficiently. (A)</p> Signup and view all the answers

Which type of animals commonly use external fertilization as a reproductive strategy?

<p>Amphibians (D)</p> Signup and view all the answers

What evolutionary advancement provides protection to the developing embryo from dehydration and physical harm?

<p>Placental development (D)</p> Signup and view all the answers

What is the primary advantage of external fertilization in vertebrates?

<p>Increased chances of successful fertilization (A)</p> Signup and view all the answers

Why does internal fertilization allow terrestrial animals to reproduce without needing a watery environment?

<p>It increases the likelihood of sperm meeting egg inside the female's body. (D)</p> Signup and view all the answers

What is the role of the corpus luteum in the menstrual cycle?

<p>Secretes progesterone to prepare the endometrium for potential pregnancy (A)</p> Signup and view all the answers

During which phase of the menstrual cycle does ovulation occur?

<p>Follicular Phase (D)</p> Signup and view all the answers

What triggers ovulation in the menstrual cycle?

<p>Peaking levels of LH (D)</p> Signup and view all the answers

What is the function of the amnion and chorion during pregnancy?

<p>Form the placenta (D)</p> Signup and view all the answers

What is the primary function of the fallopian tubes in the female reproductive system?

<p>Transport of egg cells to the uterus (C)</p> Signup and view all the answers

What is the primary function of the Cowper’s Gland in the male reproductive system?

<p>Neutralizing acidic environment of the vagina (A)</p> Signup and view all the answers

Where does sperm mature and get stored after being produced in the testes?

<p>Epididymis (B)</p> Signup and view all the answers

What is the role of the Fallopian Tubes in the female reproductive system?

<p>Transport of egg cells from the ovary to the uterus (D)</p> Signup and view all the answers

What is the primary responsibility of the cerebrum?

<p>Controlling voluntary actions and intelligence (A)</p> Signup and view all the answers

What hormone stimulates the development of male secondary sexual characteristics?

<p>Testosterone (A)</p> Signup and view all the answers

Which structure in the female reproductive system serves as a site for implantation of the embryo?

<p>Endometrium (A)</p> Signup and view all the answers

What is the function of villi in the development of the embryo after implantation?

<p>Growth into uterine tissue to form the placenta (D)</p> Signup and view all the answers

In the human nervous system, what is the primary function of effectors?

<p>Responding to stimuli (D)</p> Signup and view all the answers

What is the role of synapses in neuron communication within the nervous system?

<p>Forming gaps between neurons for impulse transmission (B)</p> Signup and view all the answers

Which component of the central nervous system acts as the primary control center for processing and transmitting information throughout the body?

<p>Brain (D)</p> Signup and view all the answers

What is the main function of the parasympathetic nervous system?

<p>Decreases heart rate and blood pressure (A)</p> Signup and view all the answers

Which type of neuron carries impulses away from the central nervous system to muscles and glands?

<p>Motor (Efferent) Neurons (B)</p> Signup and view all the answers

What is the role of adrenaline in the 'fight or flight' response?

<p>Increases blood pressure (D)</p> Signup and view all the answers

Which part of a neuron fills the cell body and supports various cellular processes?

<p>Cytoplasm (D)</p> Signup and view all the answers

At which point do sensory neurons transmit impulses from receptors to the spinal cord and brain?

<p>When sensing stimuli (C)</p> Signup and view all the answers

What is the primary function of interneurons in the nervous system?

<p>Connect sensory and motor neurons, playing crucial roles in interpreting sensory input and generating motor output (D)</p> Signup and view all the answers

Which part of the central nervous system controls involuntary actions like the heartbeat?

<p>Medulla Oblongata (B)</p> Signup and view all the answers

What is the primary function of the Autonomic Nervous System in the peripheral nervous system?

<p>Manages involuntary functions like heartbeat and digestion (B)</p> Signup and view all the answers

What is the main responsibility of the Corpus Callosum in the brain?

<p>Facilitate communication between the left and right hemispheres of the brain (D)</p> Signup and view all the answers

What is the specific function of Motor (Efferent) Neurons in the nervous system?

<p>Transmit impulses from the brain to effectors like muscles and glands (A)</p> Signup and view all the answers

What is the advantage of ovipary as a reproductive mode in animals?

<p>Allowing parents to produce many offspring simultaneously (D)</p> Signup and view all the answers

Which reproductive mode provides a controlled environment for the development of offspring and reduces the risk of predation?

<p>Vivipary (B)</p> Signup and view all the answers

Why do ovoviviparous animals, like certain species of snakes and sharks, retain eggs within the mother's body?

<p>To reduce metabolic costs associated with true vivipary (A)</p> Signup and view all the answers

Which developmental strategy involves producing relatively mature and independent offspring with the ability to stand, walk, or swim shortly after birth?

<p>Precocial (C)</p> Signup and view all the answers

How does parental care directly influence the reproductive success of vertebrates?

<p>By increasing the survival rates of the young (B)</p> Signup and view all the answers

What is the primary role of the amniotic egg in vertebrates?

<p>Preventing dehydration and physical harm to the embryo (B)</p> Signup and view all the answers

Which group of animals utilizes the ovovivipary reproductive mode?

<p>Some species of snakes and sharks (D)</p> Signup and view all the answers

What defines the Precocial developmental strategy in vertebrates?

<p>Offspring born relatively mature and independent (D)</p> Signup and view all the answers

How does Vivipary differ from Ovipary in terms of offspring development?

<p>Developing inside the mother with controlled environment (B)</p> Signup and view all the answers

In vertebrates, which feature enhances the survival rates of offspring by providing a controlled environment for development?

<p>Amniotic egg (A)</p> Signup and view all the answers

In vertebrates, what is a key advantage of internal fertilization compared to external fertilization?

<p>Increased offspring survival rates due to controlled environment (A)</p> Signup and view all the answers

Which environmental condition is essential for external fertilization to occur in vertebrates?

<p>Water (D)</p> Signup and view all the answers

What evolutionary advantage does internal fertilization offer terrestrial animals?

<p>Ability to reproduce without the need for a watery environment (B)</p> Signup and view all the answers

Which type of animals commonly utilize external fertilization as a reproductive strategy?

<p>Fish (C)</p> Signup and view all the answers

What key benefit does external fertilization provide in terms of offspring numbers?

<p>Ability to produce a larger number of offspring (B)</p> Signup and view all the answers

What is the function of the corpus luteum in the menstrual cycle?

<p>Produces progesterone to prepare the endometrium for pregnancy (B)</p> Signup and view all the answers

Which hormone peaks around day 14 of the menstrual cycle, triggering ovulation and the formation of the corpus luteum?

<p>LH (A)</p> Signup and view all the answers

What is the primary role of the amnion and chorion during pregnancy?

<p>Formation of extra-embryonic membranes (D)</p> Signup and view all the answers

During copulation, where do sperm cells typically penetrate an ovum to lead to fertilization?

<p>Jelly layer (A)</p> Signup and view all the answers

What is the main role of FSH in the menstrual cycle?

<p>Stimulate follicle development in the ovaries (D)</p> Signup and view all the answers

What is the primary hormone driving female puberty?

<p>Oestrogen (B)</p> Signup and view all the answers

During spermatogenesis, what is the function of the acrosome in a sperm cell?

<p>Enabling the sperm to penetrate the egg (C)</p> Signup and view all the answers

In oogenesis, what is the fate of most haploid cells produced?

<p>They degenerate (C)</p> Signup and view all the answers

What triggers the enlargement of a follicle in females during each menstrual cycle?

<p>Luteinizing hormone (LH) (B)</p> Signup and view all the answers

Which male sex cell contains either an X or a Y chromosome for sex determination?

<p>Spermatozoon (D)</p> Signup and view all the answers

What is the main function of the seminal vesicles in the male reproductive system?

<p>Producing a nutrient-rich fluid for sperm energy (A)</p> Signup and view all the answers

Which part of the female reproductive system is responsible for transporting egg cells from the ovary to the uterus?

<p>Fallopian Tubes (B)</p> Signup and view all the answers

What is the primary role of the vas deferens (sperm duct) in the male reproductive system?

<p>Transporting sperm from the testes to the urethra (A)</p> Signup and view all the answers

What is the purpose of Cowper's Gland (Bulbourethral Gland) in the male reproductive system?

<p>Releasing a mucus-like fluid before ejaculation (A)</p> Signup and view all the answers

Where does sperm cells mature and get stored after being produced in the male reproductive system?

<p>Epididymis (C)</p> Signup and view all the answers

What structures develop from the outer membrane of the embryo post-implantation?

<p>Villi (B)</p> Signup and view all the answers

What is the function of the umbilical cord in the placental connection?

<p>Delivers nutrients to the placenta (B)</p> Signup and view all the answers

Which part of the nervous system controls involuntary bodily functions like heart rate and digestion?

<p>Autonomic Nervous System (C)</p> Signup and view all the answers

What is the primary function of the amnion in fetal development?

<p>Protection and cushioning (B)</p> Signup and view all the answers

Which term describes a detectable change in the environment that triggers an electrical signal in response?

<p>Stimulus (D)</p> Signup and view all the answers

What is the primary function of the autonomic nervous system?

<p>Preparing the body for emergency situations (A)</p> Signup and view all the answers

Which branch of the autonomic nervous system decreases heart rate and dilates blood vessels?

<p>Parasympathetic Nervous System (A)</p> Signup and view all the answers

What is the role of interneurons in the nervous system?

<p>Link sensory neurons to motor neurons (D)</p> Signup and view all the answers

Which part of a neuron transmits impulses away from the cell body?

<p>Axon (B)</p> Signup and view all the answers

What is the main function of sensory (afferent) neurons?

<p>Sensing stimuli and transmitting impulses towards the central nervous system (D)</p> Signup and view all the answers

What is the primary function of the medulla oblongata in the brain?

<p>Transmitting nerve impulses between the spinal cord and the brain (D)</p> Signup and view all the answers

Which part of the brain is primarily responsible for coordinating all voluntary movements and maintaining balance?

<p>Cerebellum (A)</p> Signup and view all the answers

What is the main role of the corpus callosum in the brain's structure and function?

<p>Connecting the left and right hemispheres of the brain (D)</p> Signup and view all the answers

Which part of the central nervous system is responsible for maintaining body homeostasis through control over functions like hunger, thirst, sleep, and body temperature?

<p>Hypothalamus (B)</p> Signup and view all the answers

Which part of the peripheral nervous system controls voluntary muscles, allowing the body to react to changes in the external environment?

<p>Somatic Nervous System (C)</p> Signup and view all the answers

What advantage does external fertilization offer to vertebrates, especially in terms of offspring survival?

<p>Production of a large number of offspring (B)</p> Signup and view all the answers

Which reproductive strategy allows terrestrial animals to reproduce without the need for a watery environment?

<p>Internal fertilization (A)</p> Signup and view all the answers

What is a key advantage of internal fertilization over external fertilization in vertebrates?

<p>Protection of eggs from predators (C)</p> Signup and view all the answers

Why does external fertilization require specific environmental conditions that are not needed for internal fertilization?

<p>To facilitate the process in a watery environment (B)</p> Signup and view all the answers

What is one significant advantage of internal fertilization that contributes to successful reproduction in vertebrates?

<p>Enhanced synchronization between sperm and egg (B)</p> Signup and view all the answers

What drives female puberty?

<p>Oestrogen (A)</p> Signup and view all the answers

Which hormone is responsible for the process of male gamete production?

<p>Testosterone (C)</p> Signup and view all the answers

What structure in a sperm cell contains enzymes for penetrating the egg during fertilization?

<p>Acrosome (B)</p> Signup and view all the answers

Which cells divide through mitosis to form multiple follicles in females during oogenesis?

<p>Diploid germinal epithelium cells (A)</p> Signup and view all the answers

What regulates the menstrual cycle, occurring approximately every 28 days in females?

<p>Follicle-stimulating hormone (FSH) (D)</p> Signup and view all the answers

Which reproductive mode is characterized by retaining eggs within the mother's body until they are ready to hatch?

<p>Vivipary (B)</p> Signup and view all the answers

What is a key advantage of precocial developmental strategy in vertebrates?

<p>Ability to fend for themselves against predators early on (B)</p> Signup and view all the answers

Which of the following is a function of parental care in vertebrates?

<p>Directly influencing the reproductive success of parents (B)</p> Signup and view all the answers

What evolutionary advancement provides a self-contained aquatic environment for the developing embryo, protecting it from dehydration and physical harm?

<p>Amniotic egg (B)</p> Signup and view all the answers

What is the significant advantage of internal fertilization in vertebrates compared to external fertilization?

<p>Greater protection for developing embryos (C)</p> Signup and view all the answers

What is the function of the Cowper's Gland (Bulbourethral Gland) in the male reproductive system?

<p>Neutralizing acidic environment in the vagina (C)</p> Signup and view all the answers

Where is the site of fertilization in the female reproductive system?

<p>Fallopian Tubes (C)</p> Signup and view all the answers

What is the primary function of the Seminal Vesicles in the male reproductive system?

<p>Providing energy for sperm cells (C)</p> Signup and view all the answers

Which gland is responsible for producing an alkaline fluid that neutralizes the acidic environment of the vagina?

<p>Prostate Gland (D)</p> Signup and view all the answers

What is the key function of the Vas Deferens (Sperm Duct) in the male reproductive system?

<p>Transporting sperm from epididymis to urethra (B)</p> Signup and view all the answers

What is the main function of the Hypothalamus in the brain?

<p>Acting as a control center for autonomic functions (D)</p> Signup and view all the answers

Which part of the central nervous system is responsible for coordinating all voluntary movements and balance?

<p>Cerebellum (D)</p> Signup and view all the answers

Which type of neurons transmit impulses from the brain and spinal cord to effectors like muscles and glands?

<p>Motor (Efferent) Neurons (C)</p> Signup and view all the answers

Which nervous system component controls involuntary muscles like the heartbeat and digestion?

<p>Autonomic Nervous System (B)</p> Signup and view all the answers

What is the primary role of the Spinal Cord in the central nervous system?

<p>Transmitting sensory information to the brain (A)</p> Signup and view all the answers

What is the main function of the corpus luteum in the menstrual cycle?

<p>Producing progesterone (C)</p> Signup and view all the answers

During which phase of the menstrual cycle does the corpus luteum transform into the corpus albicans?

<p>Luteal Phase (C)</p> Signup and view all the answers

What triggers the release of an egg cell during ovulation in females?

<p>Increased LH levels (B)</p> Signup and view all the answers

Which enzyme is secreted by the blastocyst to aid in implantation during pregnancy?

<p>Enzymes (D)</p> Signup and view all the answers

What is the function of the amnion during pregnancy?

<p>Protect the embryo with amniotic fluid (D)</p> Signup and view all the answers

What is the term used to refer to the time from fertilization to birth in humans?

<p>Gestation period (D)</p> Signup and view all the answers

Which component of the human nervous system regulates involuntary bodily functions and is further divided into sympathetic and parasympathetic systems?

<p>Peripheral nervous system (A)</p> Signup and view all the answers

What is the name of the fluid-filled sac where the embryo is enclosed during development?

<p>Amnion (B)</p> Signup and view all the answers

Which part of a neuron is responsible for transmitting impulses and contains gaps called synapses where neurotransmitters pass signals?

<p>Synapses (A)</p> Signup and view all the answers

When does the zygote form structures like limbs and necessary body organs during human development?

<p>After 8 weeks (A)</p> Signup and view all the answers

What is the primary function of the autonomic nervous system?

<p>Maintain homeostasis (C)</p> Signup and view all the answers

Which branch of the autonomic nervous system is responsible for the 'fight or flight' response?

<p>Sympathetic Nervous System (D)</p> Signup and view all the answers

What is the role of interneurons in the nervous system?

<p>Link sensory neurons to motor neurons (A)</p> Signup and view all the answers

Which part of a neuron carries impulses away from the cell body?

<p>Axon (A)</p> Signup and view all the answers

What is the main function of adrenaline in the 'fight or flight' response?

<p>Stimulate sweat secretion (C)</p> Signup and view all the answers

What is a key advantage of external fertilization in vertebrates compared to internal fertilization?

<p>Dependence on a watery environment (A)</p> Signup and view all the answers

Which type of animals commonly use internal fertilization as a reproductive strategy?

<p>Terrestrial animals (B)</p> Signup and view all the answers

What is the primary advantage of internal fertilization over external fertilization in vertebrates?

<p>Reduced need for specific environmental conditions (C)</p> Signup and view all the answers

Why does external fertilization typically result in a larger number of offspring in vertebrates?

<p>Sperm meeting egg outside the body (A)</p> Signup and view all the answers

Which characteristic of external fertilization makes it more suitable for vertebrates in aquatic environments?

<p>Need for a watery environment (A)</p> Signup and view all the answers

What is the main advantage of ovipary in terms of reproductive success?

<p>Ability to produce many offspring simultaneously (C)</p> Signup and view all the answers

Which feature distinguishes precocial offspring from altricial offspring?

<p>Can stand and walk shortly after birth (A)</p> Signup and view all the answers

What evolutionary advancement provides a self-contained aquatic environment for the developing embryo?

<p>Amniotic egg (D)</p> Signup and view all the answers

In vertebrates, what is a key aspect of the diversity of reproductive strategies?

<p>Parental care type (A)</p> Signup and view all the answers

Which reproductive mode combines aspects of ovipary and vivipary while providing protection to the eggs?

<p>Ovovivipary (D)</p> Signup and view all the answers

What is the main function of the Seminal Vesicles in the male reproductive system?

<p>Producing a nutrient-rich fluid for sperm energy (A)</p> Signup and view all the answers

Where does a sperm cell mature and get stored after being produced in the testes?

<p>Epididymis (D)</p> Signup and view all the answers

What is the primary role of the Prostate Gland in the male reproductive system?

<p>Producing an alkaline fluid as part of semen (D)</p> Signup and view all the answers

What is the function of the Vas Deferens (Sperm Duct) in the male reproductive system?

<p>Transporting sperm from testes to urethra (C)</p> Signup and view all the answers

Where does fertilization typically occur in the female reproductive system?

<p>Fallopian Tubes (D)</p> Signup and view all the answers

What is the primary hormone driving male gamete production?

<p>Testosterone (D)</p> Signup and view all the answers

What is the function of the acrosome in a sperm cell?

<p>Penetration of the egg's outer layers (A)</p> Signup and view all the answers

Which hormone regulates the cyclical production of ova in females?

<p>Follicle-stimulating hormone (C)</p> Signup and view all the answers

What is the primary function of mitochondria in a sperm cell?

<p>Energy supply (D)</p> Signup and view all the answers

During oogenesis, what happens to most haploid cells produced?

<p>They degenerate (C)</p> Signup and view all the answers

What is the function of the corpus luteum in the menstrual cycle?

<p>Secretes progesterone to prepare the endometrium for potential pregnancy (C)</p> Signup and view all the answers

Which hormone is primarily responsible for thickening the endometrium in the uterus?

<p>Progesterone (B)</p> Signup and view all the answers

During which phase of the menstrual cycle does the Graafian follicle burst to release an egg cell?

<p>Ovulation (A)</p> Signup and view all the answers

What triggers the development of more blood vessels and glands in the endometrium during the menstrual cycle?

<p>Secretion of oestrogen (D)</p> Signup and view all the answers

What is the process known as when the blastocyst embeds itself into the endometrium?

<p>Implantation (C)</p> Signup and view all the answers

What is the pivotal role of the central nervous system (CNS) in the human body?

<p>Processing and transmitting information throughout the body (B)</p> Signup and view all the answers

During which stage of human development does the zygote form a morula, then a blastocyst, and finally an embryo?

<p>Development of the Zygote (D)</p> Signup and view all the answers

What is the function of the villi in the development of the embryo post-implantation?

<p>Develop into the placenta (D)</p> Signup and view all the answers

Which component of the peripheral nervous system controls involuntary bodily functions?

<p>Autonomic system (C)</p> Signup and view all the answers

What is the primary function of the amniotic fluid during fetal development?

<p>Protect from physical harm (B)</p> Signup and view all the answers

What is the main function of the Medulla Oblongata?

<p>Controlling involuntary actions like heartbeat and breathing (A)</p> Signup and view all the answers

Which part of the brain plays a key role in maintaining the body's homeostasis?

<p>Hypothalamus (D)</p> Signup and view all the answers

What type of neurons detect stimuli and transmit impulses from sense organs to the spinal cord and brain?

<p>Sensory (Afferent) Neurons (C)</p> Signup and view all the answers

Which part of the nervous system controls involuntary muscles such as the heartbeat and digestion?

<p>Autonomic Nervous System (D)</p> Signup and view all the answers

What are the building blocks of the central nervous system that transmit impulses within the brain and spinal cord?

<p>Neurons (A)</p> Signup and view all the answers

What is the main function of the sympathetic nervous system?

<p>Increases blood pressure and stimulates adrenaline secretion (C)</p> Signup and view all the answers

What is the primary function of interneurons in the nervous system?

<p>Link sensory neurons to motor neurons (A)</p> Signup and view all the answers

What role does adrenaline play in the 'fight or flight' response?

<p>Prepares the body for emergencies (B)</p> Signup and view all the answers

Which component of a neuron speeds up the transmission of electrical impulses and provides insulation?

<p>Myelin Sheath (A)</p> Signup and view all the answers

What distinguishes sensory (afferent) neurons from motor (efferent) neurons?

<p>Motor neurons transmit impulses towards the central nervous system (C)</p> Signup and view all the answers

Where does sperm mature and get stored after being produced in the male reproductive system?

<p>Epididymis (C)</p> Signup and view all the answers

Which gland in the male reproductive system produces a mucus-like fluid to lubricate the urethra for easier passage of sperm?

<p>Cowper’s Gland (Bulbourethral Gland) (C)</p> Signup and view all the answers

What is the primary role of the acrosome in a sperm cell?

<p>Penetrating the egg cell during fertilization (A)</p> Signup and view all the answers

Which female reproductive structure is the site of implantation and placenta formation?

<p>Endometrium (D)</p> Signup and view all the answers

What is the function of the Vulva in the female reproductive system?

<p>Protecting the entrance to the vagina (D)</p> Signup and view all the answers

What is a key advantage of vivipary as a mode of reproduction in animals?

<p>Providing a controlled environment for development (A)</p> Signup and view all the answers

What is a characteristic of precocial species in terms of offspring development?

<p>Can stand, walk, or swim shortly after birth (B)</p> Signup and view all the answers

What evolutionary advancement provides a self-contained aquatic environment for the developing embryo?

<p>Amniotic egg (D)</p> Signup and view all the answers

Which part of the male reproductive system is primarily responsible for producing sperm cells?

<p>Testes (B)</p> Signup and view all the answers

What is a key aspect of the diversity of parental care in vertebrates?

<p>Closely linked to reproductive strategy and developmental mode (B)</p> Signup and view all the answers

In vertebrates, what advantage does internal fertilization provide compared to external fertilization?

<p>Greater likelihood of successful fertilization (C)</p> Signup and view all the answers

Which environmental condition is crucial for external fertilization to occur in vertebrates?

<p>Water availability (C)</p> Signup and view all the answers

How does external fertilization contribute to increasing offspring survival under high mortality rates?

<p>Enables a higher number of offspring (D)</p> Signup and view all the answers

Which type of animals are more likely to exhibit external fertilization as a reproductive strategy?

<p>Aquatic fish (A)</p> Signup and view all the answers

What key feature of internal fertilization enables terrestrial animals to reproduce without a water environment?

<p>Fertilization inside the female's body (B)</p> Signup and view all the answers

What hormone is responsible for thickening the endometrium in the uterus?

<p>Progesterone (A)</p> Signup and view all the answers

Which hormone triggers ovulation and the formation of the corpus luteum?

<p>LH (B)</p> Signup and view all the answers

During fertilization, what is formed when the nuclei of the ovum and sperm cell fuse?

<p>Zygote (D)</p> Signup and view all the answers

What is the process called when the blastocyst embeds itself into the endometrium of the uterus?

<p>Implantation (B)</p> Signup and view all the answers

Which hormone is secreted by the placenta and contributes to supporting pregnancy?

<p>Progesterone (C)</p> Signup and view all the answers

What hormone primarily drives female puberty?

<p>Oestrogen (A)</p> Signup and view all the answers

Which hormone is responsible for the production of male gametes in the testes?

<p>Testosterone (B)</p> Signup and view all the answers

What is the primary function of the middle portion of a sperm cell?

<p>Energy production (B)</p> Signup and view all the answers

Which structure in females undergoes meiosis to produce haploid ovum cells?

<p>Ovary (A)</p> Signup and view all the answers

During what phase of the menstrual cycle does the endometrium break down and shed from the uterus?

<p>Menstruation (D)</p> Signup and view all the answers

What is the primary function of the Parasympathetic Nervous System?

<p>Decreases heart rate and blood pressure (B)</p> Signup and view all the answers

Where are interneurons primarily found in the body?

<p>Brain and spinal cord (C)</p> Signup and view all the answers

What is the role of the myelin sheath covering the axon of a neuron?

<p>Provides insulation and speeds up impulse transmission (C)</p> Signup and view all the answers

What is the primary function of the cerebellum in the brain?

<p>Controls voluntary muscle movements and balance (A)</p> Signup and view all the answers

Which system is responsible for preparing the body for 'fight or flight' responses?

<p>Sympathetic Nervous System (B)</p> Signup and view all the answers

Which part of the central nervous system is responsible for connecting the brain and peripheral nervous system?

<p>Spinal cord (C)</p> Signup and view all the answers

What is the function of dendrites in a neuron?

<p>Receive signals from other neurons and transmit them towards the cell body (D)</p> Signup and view all the answers

What is the primary role of motor (efferent) neurons in the nervous system?

<p>Transmit signals from the brain to muscles and glands (D)</p> Signup and view all the answers

Which part of the brain is involved in memory, reasoning, and intelligence processes?

<p>Cerebrum (C)</p> Signup and view all the answers

What is the key function of sensory (afferent) neurons in the nervous system?

<p>Detect stimuli and transmit impulses to the brain (D)</p> Signup and view all the answers

Which structure in the female reproductive system develops finger-like structures called villi after implantation?

<p>Chorion (B)</p> Signup and view all the answers

What is the primary function of the umbilical cord in the connection between the placenta and the embryo?

<p>Carrying deoxygenated blood from the placenta to the embryo (A)</p> Signup and view all the answers

In the nervous system, what do receptors do?

<p>Respond to stimuli (B)</p> Signup and view all the answers

During human development, what is formed after the zygote divides by mitosis?

<p>Morula (A)</p> Signup and view all the answers

Which part of the nervous system consists of cranial and spinal nerves outside the central nervous system?

<p>Somatic system (C)</p> Signup and view all the answers

What is a key advantage of internal fertilization in vertebrates over external fertilization?

<p>Higher chance of sperm meeting egg (B)</p> Signup and view all the answers

Which statement accurately describes external fertilization in vertebrates?

<p>Occurs outside the female's body (A)</p> Signup and view all the answers

What is the primary advantage of external fertilization in vertebrates compared to internal fertilization?

<p>Lower offspring mortality rates (C)</p> Signup and view all the answers

How does internal fertilization enable terrestrial animals to reproduce successfully?

<p>By allowing fertilization inside the female's body (B)</p> Signup and view all the answers

Which environmental condition is necessary for external fertilization to occur in vertebrates?

<p>Availability of water (A)</p> Signup and view all the answers

What is the primary hormone involved in driving female puberty?

<p>Oestrogen (A)</p> Signup and view all the answers

Which cells divide through mitosis to produce male gametes?

<p>Diploid germinal epithelial cells (B)</p> Signup and view all the answers

What is the primary function of the acrosome in a sperm cell?

<p>Penetrating the egg's outer layers during fertilization (B)</p> Signup and view all the answers

Which phase of the ovarian cycle involves the development of a mature Graafian follicle in the ovaries?

<p>Follicular Phase (D)</p> Signup and view all the answers

What triggers the enlargement of one follicle that leads to the production of a mature ovum during oogenesis?

<p>Follicle-stimulating hormone (FSH) (B)</p> Signup and view all the answers

Where do sperm cells mature and get stored after being produced in the testes?

<p>Epididymis (C)</p> Signup and view all the answers

What is the primary function of the Cowper’s Gland (Bulbourethral Gland) in the male reproductive system?

<p>Neutralize acidic urine in the urethra (B)</p> Signup and view all the answers

Which gland produces an alkaline fluid that neutralizes the acidic environment of the vagina?

<p>Prostate Gland (A)</p> Signup and view all the answers

What is the primary role of the Seminal Vesicles in the male reproductive system?

<p>Provide energy for sperm cells (C)</p> Signup and view all the answers

Which part of the male reproductive system is a muscular tube that transports sperm from the epididymis to the urethra?

<p>Vas Deferens (C)</p> Signup and view all the answers

What is the advantage of ovipary in reproduction?

<p>Ability to produce many offspring simultaneously (B)</p> Signup and view all the answers

How does precocial development differ from altricial development in vertebrates?

<p>Altricial offspring can stand, walk, or swim shortly after birth. (C)</p> Signup and view all the answers

Which statement accurately describes the developmental strategy of ovovivipary?

<p>Metabolic costs associated with true vivipary are avoided. (C)</p> Signup and view all the answers

What is a key feature of the amniotic egg that enhances the survival of terrestrial vertebrate embryos?

<p>Protects the embryo from dehydration and physical harm (C)</p> Signup and view all the answers

How does vivipary contribute to the survival of offspring in mammals?

<p>It provides a controlled environment for embryonic development. (B)</p> Signup and view all the answers

During which phase of the menstrual cycle does the corpus luteum transform into a structure that secretes progesterone?

<p>Luteal Phase (B)</p> Signup and view all the answers

What stimulates the development of the follicle in the ovaries during the menstrual cycle?

<p>FSH (B)</p> Signup and view all the answers

Which hormone is responsible for thickening the endometrium in the uterus during the menstrual cycle?

<p>Oestrogen (B)</p> Signup and view all the answers

After fertilization, what structure is formed as a result of the fusion of the ovum and sperm cell nuclei?

<p>Zygote (A)</p> Signup and view all the answers

What happens if fertilization does not occur during the menstrual cycle?

<p>Corpus Luteum shrinks and stops producing progesterone (C)</p> Signup and view all the answers

What is the primary role of the Corpus Callosum in the brain?

<p>Facilitates communication between the left and right brain hemispheres (B)</p> Signup and view all the answers

Which part of the brain is primarily responsible for maintaining body balance and coordinating voluntary movements?

<p>Cerebellum (A)</p> Signup and view all the answers

What are the main functions of the Medulla Oblongata in the nervous system?

<p>Transmits nerve impulses between the spinal cord and brain (B)</p> Signup and view all the answers

Which component of the nervous system is responsible for maintaining homeostasis by controlling functions like hunger, thirst, and body temperature?

<p>Hypothalamus (C)</p> Signup and view all the answers

What is the function of Interneurons in the nervous system?

<p>Connect sensory and motor neurons, aiding in information processing (C)</p> Signup and view all the answers

What is the term used to describe the time from fertilization to birth in humans?

<p>Gestation period (D)</p> Signup and view all the answers

Which structure connects the placenta to the embryo in the human developmental process?

<p>Umbilical cord (D)</p> Signup and view all the answers

What is the main function of the amniotic fluid during fetal development?

<p>Provide oxygen to the fetus (B)</p> Signup and view all the answers

Which system is responsible for coordinating involuntary bodily functions in humans?

<p>Autonomic nervous system (A)</p> Signup and view all the answers

What marks the transition from an embryo to a fetus during human development?

<p>After 12 weeks of gestation (D)</p> Signup and view all the answers

What is the main function of the Parasympathetic Nervous System?

<p>Decreases heart rate and narrows bronchioles (B)</p> Signup and view all the answers

What is the key role of the Myelin Sheath in a neuron?

<p>Enables the transmission of electrical impulses and speeds up their conduction (C)</p> Signup and view all the answers

Which neuron type plays a significant role in processing information and linking sensory neurons to motor neurons?

<p>Interneurons (Connectors) (B)</p> Signup and view all the answers

What is the primary effect of the Sympathetic Nervous System during 'fight or flight' situations?

<p>Stimulates the secretion of adrenaline (A)</p> Signup and view all the answers

What is the function of dendrites in a neuron?

<p>Receive signals from other neurons and transmit them away from the cell body (B)</p> Signup and view all the answers

What is the function of the choroid in the human eye?

<p>To absorb light and prevent reflection (C)</p> Signup and view all the answers

Which part of the human eye contains cones for bright light and color vision?

<p>Retina (D)</p> Signup and view all the answers

What is the main role of the yellow spot (macula) in the human eye?

<p>To provide clearest vision with cones (B)</p> Signup and view all the answers

What is the primary function of the ciliary muscles in the human eye?

<p>To alter tension on suspensory ligaments for lens accommodation (B)</p> Signup and view all the answers

In human vision, what happens when viewing objects further than 6 meters?

<p>The radial muscles relax and circular muscles contract (A)</p> Signup and view all the answers

What is the primary function of a reflex arc?

<p>Convert stimuli to reflex responses without involving the brain (D)</p> Signup and view all the answers

Which component of a reflex arc carries the impulse from the receptor to the spinal cord?

<p>Sensory neuron (B)</p> Signup and view all the answers

What is the role of an interneuron in the structure of a reflex arc?

<p>Processes and relays impulses within the spinal cord (B)</p> Signup and view all the answers

Which structure in a reflex arc is responsible for producing a response to a stimulus?

<p>Effector (D)</p> Signup and view all the answers

What is the sequence of impulse transmission in a reflex arc from the receptor to the effector?

<p>Receptor → Sensory Neuron → Interneuron → Motor Neuron (D)</p> Signup and view all the answers

What is the significance of a reflex action in the body's response to danger or harm?

<p>To provide an immediate response without involving the brain (B)</p> Signup and view all the answers

In the context of neurodegenerative conditions, what is a key characteristic of Alzheimer's disease?

<p>It leads to progressive brain cell death over time (C)</p> Signup and view all the answers

Which component of a neuron is responsible for transmitting nerve impulses away from the cell body?

<p>Axon (C)</p> Signup and view all the answers

How does multiple sclerosis (MS) affect neuron function in the body?

<p>By impairing the proper function of neurons through attacks on the myelin sheath (D)</p> Signup and view all the answers

What distinguishes effectors from receptors and neurons in the nervous system?

<p>Effectors respond to nerve impulses by contracting muscles or secreting substances (D)</p> Signup and view all the answers

What is the function of the Eustachian tube in the human ear?

<p>Equalizing pressure on both sides of the tympanic membrane (D)</p> Signup and view all the answers

Which structure in the ear is responsible for converting sound into nerve impulses?

<p>Cochlea (C)</p> Signup and view all the answers

What is the function of the cristae in the semi-circular canals of the inner ear?

<p>Detecting changes in speed and direction of the body (A)</p> Signup and view all the answers

How do cochlear implants differ from hearing aids in treating deafness?

<p>Convert sound vibrations into electrical impulses for direct nerve transmission (C)</p> Signup and view all the answers

Which glands release their products directly into the bloodstream to exert systemic effects?

<p>Endocrine glands (D)</p> Signup and view all the answers

Which endocrine gland secretes hormones that control growth, metabolic rate, and reproductive functions?

<p>Thyroid gland (C)</p> Signup and view all the answers

What is the primary function of adrenaline secreted by the adrenal glands?

<p>Prepares the body for 'fight or flight' responses (D)</p> Signup and view all the answers

Which hormone is produced by the pancreas to regulate blood glucose levels by promoting glycogen breakdown in the liver?

<p>Glucagon (D)</p> Signup and view all the answers

What is the primary role of the pituitary gland's growth hormone (GH) in the body?

<p>Control growth processes (C)</p> Signup and view all the answers

Which pair of hormones are primarily responsible for regulating blood glucose levels in opposite ways?

<p>Insulin and glucagon (D)</p> Signup and view all the answers

Why is it crucial for human enzymes to operate within a narrow temperature range around 37°C?

<p>Enzymes denature at this temperature range. (A)</p> Signup and view all the answers

What happens if there are high concentrations of carbon dioxide in the blood?

<p>Acidosis occurs, disrupting enzyme activity. (D)</p> Signup and view all the answers

Why is maintaining blood glucose levels within a tight range vital for providing energy to cells?

<p>Cells need a steady supply of energy to function effectively. (D)</p> Signup and view all the answers

How does the balance between water and electrolytes impact nerve impulse transmission and muscle contraction?

<p>Maintaining the balance is crucial for these functions. (B)</p> Signup and view all the answers

What happens when body temperature rises above the normal range?

<p>Vasodilation and sweating are activated. (D)</p> Signup and view all the answers

What is the primary role of negative feedback mechanisms in homeostasis?

<p>Detecting imbalances and initiating responses to correct them (D)</p> Signup and view all the answers

How do high blood glucose levels affect insulin and glucagon release?

<p>High glucose levels trigger glucagon release (B)</p> Signup and view all the answers

What is the impact of increased blood carbon dioxide levels on breathing rate and depth?

<p>Increased CO2 increases breathing rate (D)</p> Signup and view all the answers

How does the body regulate water balance through the action of ADH?

<p>ADH alters kidney water reabsorption to maintain blood water levels (A)</p> Signup and view all the answers

What is the role of aldosterone in salt balance regulation?

<p>Aldosterone regulates sodium and potassium levels (A)</p> Signup and view all the answers

Which hormones regulate metabolism, energy generation, and neural development?

<p>Thyroxin and TSH (C)</p> Signup and view all the answers

What is the primary function of negative feedback mechanisms in homeostasis?

<p>Detecting imbalances and initiating responses to correct them (D)</p> Signup and view all the answers

How does the body respond to heat during thermoregulation?

<p>Vasodilation and sweating to cool the body (D)</p> Signup and view all the answers

How do low blood glucose levels impact glucagon release?

<p>Low glucose levels trigger glucagon release (D)</p> Signup and view all the answers

What happens when carbon dioxide levels in the blood are increased?

<p>Increased CO2 triggers increased breathing rate (D)</p> Signup and view all the answers

What is the primary role of the interneuron in a reflex arc?

<p>Carrying the impulse from the sensory neuron to the motor neuron (B)</p> Signup and view all the answers

Which component of a reflex arc directly carries the impulse from the spinal cord to the muscles or glands?

<p>Motor Neuron (A)</p> Signup and view all the answers

During a reflex action, which structure converts a stimulus into an impulse?

<p>Receptor (C)</p> Signup and view all the answers

What is the main function of an effector in a reflex arc?

<p>Producing the response by contracting or secreting (A)</p> Signup and view all the answers

In a reflex arc, which structure carries the impulse from the receptor to the spinal cord?

<p>Sensory Neuron (B)</p> Signup and view all the answers

What is the primary significance of a reflex action?

<p>To provide immediate response to avoid danger (A)</p> Signup and view all the answers

Which age group typically experiences symptoms of Alzheimer's disease?

<p>Individuals over 60 years (C)</p> Signup and view all the answers

In multiple sclerosis (MS), what is the primary target of the body's immune system?

<p>Neurons (A)</p> Signup and view all the answers

Which part of a neuron transmits the impulse to other neurons or effectors?

<p>Axon (C)</p> Signup and view all the answers

What is the primary function of effectors in the nervous system?

<p>Respond to impulses sent by the nervous system (C)</p> Signup and view all the answers

What is the primary function of the ciliary body in the human eye?

<p>Changes the lens's shape for accommodation (A)</p> Signup and view all the answers

Which visual defect is characterized by blurred vision due to an uneven curvature of the cornea or lens?

<p>Astigmatism (D)</p> Signup and view all the answers

What is the function of the vitreous humour in the human eye?

<p>Maintaining the eyeball's shape (D)</p> Signup and view all the answers

Which part of the human ear is responsible for directing sound waves into the auditory canal?

<p>Pinna (C)</p> Signup and view all the answers

What is the main purpose of binocular vision in humans?

<p>Providing depth perception (C)</p> Signup and view all the answers

Which hormone is responsible for regulating sodium and potassium balance, affecting blood pressure and fluid balance?

<p>Aldosterone (D)</p> Signup and view all the answers

Where is the thyroid gland located and what hormone does it produce to regulate metabolism, growth, and energy production?

<p>In the brain, producing thyroxine (C)</p> Signup and view all the answers

Which hormone influences female reproductive cycles, pregnancy, and secondary sexual characteristics?

<p>Oestrogen (D)</p> Signup and view all the answers

What is the primary function of cortisol, one of the hormones secreted by the adrenal glands?

<p>Regulating blood glucose levels (A)</p> Signup and view all the answers

Which gland, located in the brain, serves as a key regulatory center connecting the nervous and endocrine systems?

<p>Hypothalamus (A)</p> Signup and view all the answers

How do the ossicles contribute to the functioning of the human ear?

<p>Amplify sound and transmit vibrations to the inner ear (D)</p> Signup and view all the answers

What is the role of the Eustachian tube in the human ear?

<p>Equalizing pressure on both sides of the tympanic membrane (B)</p> Signup and view all the answers

How are hormones from endocrine glands different from those of exocrine glands?

<p>Endocrine hormones are released directly into the bloodstream, while exocrine hormones are secreted to external surfaces or body cavities (A)</p> Signup and view all the answers

What is the primary function of the bony labyrinth in the inner ear?

<p>Filled with perilymph fluid and houses semi-circular canals and cochlea (A)</p> Signup and view all the answers

How do cochlear implants differ from hearing aids in addressing deafness?

<p>Convert sound vibrations into electrical impulses transmitted directly to the auditory nerve (D)</p> Signup and view all the answers

Why is the constancy of the internal environment essential for efficient cellular function?

<p>To provide the optimal conditions for cells to function effectively (B)</p> Signup and view all the answers

How does the body regulate internal temperature to protect enzymatic processes?

<p>By shivering and changing blood flow (A)</p> Signup and view all the answers

Why is it important to tightly regulate carbon dioxide levels in the body?

<p>To disrupt enzyme activity (A)</p> Signup and view all the answers

Which hormones regulate blood glucose levels by facilitating glucose uptake or release from energy stores?

<p>Insulin and glucagon (A)</p> Signup and view all the answers

How does the balance between water and electrolytes impact nerve impulse transmission and muscle contraction?

<p>It is crucial for nerve impulse transmission and muscle contraction. (B)</p> Signup and view all the answers

What is the primary function of negative feedback mechanisms in homeostasis?

<p>To maintain steady-state conditions (A)</p> Signup and view all the answers

How does the body regulate blood glucose levels through negative feedback?

<p>High glucose levels increase insulin release (B)</p> Signup and view all the answers

What is the impact of increased blood carbon dioxide levels on breathing rate and depth?

<p>Increased breathing rate and depth (B)</p> Signup and view all the answers

How does the hypothalamus contribute to water balance through negative feedback mechanisms?

<p>It triggers ADH secretion from the pituitary gland (B)</p> Signup and view all the answers

Which hormone is involved in regulating thyroxin levels through negative feedback mechanisms?

<p>TSH (Thyroid Stimulating Hormone) (D)</p> Signup and view all the answers

What role does aldosterone play in salt balance through negative feedback mechanisms?

<p>Regulates blood sodium levels through kidney function (A)</p> Signup and view all the answers

In thermoregulation, what physiological response helps cool the body in response to heat?

<p>Sweating (A)</p> Signup and view all the answers

How does increased thyroxin level affect TSH (Thyroid Stimulating Hormone) release?

<p>Decreases TSH release (C)</p> Signup and view all the answers

What is the primary function of an interneuron in a reflex arc?

<p>Carrying the impulse from the sensory neuron to the motor neuron (B)</p> Signup and view all the answers

Which component of a reflex arc converts a stimulus into an impulse?

<p>Receptor (C)</p> Signup and view all the answers

In a reflex arc, where are motor neurons located?

<p>In the spinal cord (C)</p> Signup and view all the answers

What is the main function of effectors in a reflex arc?

<p>Producing responses (A)</p> Signup and view all the answers

What is the role of receptors in a reflex arc?

<p>Receiving stimuli and converting them into impulses (C)</p> Signup and view all the answers

What is the primary function of neurons in the nervous system?

<p>Converting stimuli into electrical signals (D)</p> Signup and view all the answers

How does Alzheimer's disease differ from Multiple Sclerosis (MS) in terms of age of onset?

<p>Alzheimer's symptoms emerge after the age of 60, while MS cases have been observed as early as 40. (B)</p> Signup and view all the answers

Which receptor is responsible for detecting light and color in the human sensory system?

<p>Photoreceptors (B)</p> Signup and view all the answers

What is the key role of synapses in a reflex arc?

<p>Ensuring the correct pathway for nerve impulse (D)</p> Signup and view all the answers

What distinguishes the central nervous system (CNS) from the peripheral nervous system (PNS)?

<p>CNS includes the brain and spinal cord, while PNS comprises all nerves outside the CNS. (C)</p> Signup and view all the answers

What is the primary function of the Eustachian tube in the human ear?

<p>To equalize pressure on both sides of the tympanic membrane (B)</p> Signup and view all the answers

In the cochlea, which structure contains sensory hair cells that convert sound into nerve impulses?

<p>Organ of Corti (D)</p> Signup and view all the answers

Which type of hearing impairment can be addressed by inserting grommets (draining tubes) into the tympanic membrane?

<p>Middle ear infection with fluid buildup (B)</p> Signup and view all the answers

What is the function of the choroid in the human eye?

<p>Supplies nutrients and oxygen to the retina (B)</p> Signup and view all the answers

In the human eye, what is the purpose of the vitreous humor?

<p>Maintains the eyeball's shape (D)</p> Signup and view all the answers

What is the primary role of the ciliary body in the human eye?

<p>Changes the lens's shape for accommodation (B)</p> Signup and view all the answers

Which part of the human eye is responsible for transforming light into electrical impulses?

<p>Retina (D)</p> Signup and view all the answers

What is the function of the optic nerve in the human eye?

<p>Transmits impulses to the brain for image interpretation (C)</p> Signup and view all the answers

Which hormone is crucial for regulating metabolism, growth, and energy production in the body?

<p>Thyroxine (C)</p> Signup and view all the answers

Where are adrenaline, aldosterone, and cortisol primarily produced to influence various bodily functions?

<p>Adrenal Glands (A)</p> Signup and view all the answers

Which glands are responsible for producing oestrogen and progesterone to regulate female reproductive cycles and secondary sexual characteristics?

<p>Gonads (Ovaries) (D)</p> Signup and view all the answers

Which endocrine gland is vital for maintaining homeostasis by controlling various bodily functions such as temperature, hydration, and metabolic rate?

<p>Pituitary Gland (B)</p> Signup and view all the answers

What is the primary function of insulin secreted from the Islets of Langerhans within the pancreas?

<p>Facilitates cellular uptake to lower blood glucose levels (B)</p> Signup and view all the answers

How does homeostasis contribute to the optimal functioning of cells, tissues, and organs?

<p>By ensuring stable internal conditions despite external fluctuations (B)</p> Signup and view all the answers

Why is it crucial for the body to regulate blood glucose levels within a tight range?

<p>To maintain a steady supply of energy for cells (A)</p> Signup and view all the answers

What role do negative feedback loops play in maintaining homeostasis?

<p>They counteract changes in physiological conditions (C)</p> Signup and view all the answers

How does the body respond to high carbon dioxide levels to maintain homeostasis?

<p>By expelling excess CO2 to prevent disruptions in enzyme activity (B)</p> Signup and view all the answers

Why is the balance between water and electrolytes crucial for nerve impulse transmission and muscle function?

<p>To maintain optimal conditions for nerve and muscle function (C)</p> Signup and view all the answers

What is the main function of thyroxin in the body?

<p>Regulating metabolism and energy generation (B)</p> Signup and view all the answers

How does the body respond to high glucose levels to maintain blood sugar balance?

<p>Increasing insulin release (C)</p> Signup and view all the answers

Which of the following hormones regulates blood sodium and potassium levels?

<p>Aldosterone (C)</p> Signup and view all the answers

What happens to breathing rate and depth when blood carbon dioxide levels rise?

<p>Increased breathing rate and depth (D)</p> Signup and view all the answers

Which organ detects changes in blood osmolarity to help regulate water balance?

<p>Hypothalamus (B)</p> Signup and view all the answers

What is the primary function of negative feedback mechanisms in homeostasis?

<p>Detect imbalances and restore balance (D)</p> Signup and view all the answers

Which hormone regulates water reabsorption in the kidneys to maintain blood water levels?

<p>ADH (Antidiuretic Hormone) (D)</p> Signup and view all the answers

What is the role of aldosterone in response to low blood sodium levels?

<p>Increases kidney sodium reabsorption (A)</p> Signup and view all the answers

How does the body respond to heat to maintain core temperature around 37°C?

<p>Sweating and vasodilation (A)</p> Signup and view all the answers

What triggers glucagon release in response to low glucose levels in the blood?

<p>Decreased liver glycogen (B)</p> Signup and view all the answers

Why is maintaining blood glucose levels within a tight range important?

<p>To provide a steady supply of energy for cells (D)</p> Signup and view all the answers

What is the main function of the ciliary body in the human eye?

<p>To change the shape of the lens for accommodation (A)</p> Signup and view all the answers

How does the respiratory system contribute to maintaining homeostasis?

<p>By expelling excess carbon dioxide to maintain the acid-base balance (C)</p> Signup and view all the answers

What is the function of the blind spot in the human eye?

<p>To allow the optic nerve to leave the eye (C)</p> Signup and view all the answers

What is the primary role of negative feedback loops in homeostasis?

<p>To maintain stable physiological conditions by counteracting changes (B)</p> Signup and view all the answers

Why is acromegaly a disorder associated with abnormal growth?

<p>Due to an overproduction of growth hormone in adulthood (B)</p> Signup and view all the answers

How do high levels of carbon dioxide impact enzyme activity and cellular functions?

<p>They disrupt enzyme activity and cellular functions (A)</p> Signup and view all the answers

Why is water balance crucial for nerve impulse transmission and muscle contraction?

<p>To ensure optimal cellular function in nerve and muscle tissues (D)</p> Signup and view all the answers

Which part of the inner ear is responsible for maintaining balance in humans?

<p>Semicircular canals (B)</p> Signup and view all the answers

What is the primary function of the vitreous humour in the human eye?

<p>To maintain the shape of the eyeball (B)</p> Signup and view all the answers

What is the significance of a reflex action in the body?

<p>Provides an immediate response to avoid danger (B)</p> Signup and view all the answers

In Alzheimer's disease, what is a characteristic symptom caused by progressive brain cell death?

<p>Loss of memory and confusion (A)</p> Signup and view all the answers

What is the function of neurons in the nervous system?

<p>Converting stimuli into nerve impulses (A)</p> Signup and view all the answers

What is the primary target of the body's immune system in multiple sclerosis (MS)?

<p>Myelin sheath covering neurons (D)</p> Signup and view all the answers

How does the autonomic nervous system differ from the somatic nervous system?

<p>Controls involuntary actions vs. voluntary actions (B)</p> Signup and view all the answers

What is the primary function of the interneuron in a reflex arc?

<p>Carries the impulse from the sensory neuron to the motor neuron (D)</p> Signup and view all the answers

Which structure in a reflex arc converts a stimulus into an impulse?

<p>Receptor (A)</p> Signup and view all the answers

What is the role of a motor neuron in a reflex arc?

<p>Transports the impulse from the spinal cord to the effectors (C)</p> Signup and view all the answers

Which component of a reflex arc is responsible for producing the response to a stimulus?

<p>Effector (A)</p> Signup and view all the answers

What is the specific sequence of impulse transmission in a reflex arc?

<p>Receptor → Sensory Neuron → Motor Neuron → Interneuron → Effector (B)</p> Signup and view all the answers

What is the function of the Eustachian tube in the human ear?

<p>Equalizes pressure on both sides of the tympanic membrane (C)</p> Signup and view all the answers

How do the ossicles contribute to the functioning of the human ear?

<p>Amplify and transmit vibrations from the tympanic membrane (D)</p> Signup and view all the answers

What triggers the release of an egg cell during ovulation in females?

<p>Fertilization by a sperm cell (B)</p> Signup and view all the answers

Which part of the female reproductive system is primarily responsible for producing oestrogen and progesterone?

<p>Ovaries (D)</p> Signup and view all the answers

What is the primary function of the Islets of Langerhans in the pancreas?

<p>Production of insulin and glucagon to regulate blood glucose levels (C)</p> Signup and view all the answers

What is the primary function of Cowper's Gland (Bulbourethral Gland) in the male reproductive system?

<p>Neutralize the acidic environment of the vagina (B)</p> Signup and view all the answers

Which hormone is responsible for preparing the body for 'fight or flight' responses?

<p>Adrenaline (epinephrine) (A)</p> Signup and view all the answers

Where is cortisol primarily produced and what is its main role in the body?

<p>Produced in the adrenal glands to reduce inflammation and stress response (A)</p> Signup and view all the answers

Which gland produces growth hormone (GH) and has two distinct lobes?

<p>Pituitary gland (B)</p> Signup and view all the answers

What hormones are primarily produced by the ovaries and what functions do they regulate?

<p>Oestrogen and progesterone, controlling female reproductive cycles, pregnancy, and secondary sexual characteristics (D)</p> Signup and view all the answers

What is the primary role of aldosterone in the body?

<p>Balances blood salt levels (A)</p> Signup and view all the answers

How does the body respond to high blood glucose levels?

<p>Release of insulin to lower blood sugar (C)</p> Signup and view all the answers

What is the primary function of Thyroxin in the body?

<p>Regulates metabolism and energy generation (D)</p> Signup and view all the answers

How does the body regulate blood carbon dioxide levels?

<p>By increasing breathing rate and depth (D)</p> Signup and view all the answers

What is the primary function of Antidiuretic Hormone (ADH) in osmoregulation?

<p>Alters kidney water reabsorption (B)</p> Signup and view all the answers

How does the body respond to low blood glucose levels?

<p>Releasing glucagon to increase blood sugar (D)</p> Signup and view all the answers

What happens to Thyroid Stimulating Hormone (TSH) release when thyroxin levels increase?

<p>Decreases TSH release (C)</p> Signup and view all the answers

Which hormone regulates salt balance by increasing kidney sodium reabsorption?

<p>Aldosterone (D)</p> Signup and view all the answers

What initiates the response to correct an imbalance in homeostasis?

<p>Detection of an imbalance (A)</p> Signup and view all the answers

What is the primary significance of synapses in the reflex arc?

<p>Ensure the speed and efficiency of the response (B)</p> Signup and view all the answers

What is the function of the yellow spot (Macula) in the human eye?

<p>Area of clearest vision with the highest concentration of cones (D)</p> Signup and view all the answers

In Alzheimer's disease, why is memory loss a prominent symptom?

<p>Resulting from progressive brain cell death (A)</p> Signup and view all the answers

How does the ciliary body contribute to vision in the human eye?

<p>Changes the shape of the lens for focusing on near and distant objects (A)</p> Signup and view all the answers

Which age group is most commonly affected by Multiple Sclerosis (MS)?

<p>Young adults between 20 and 40 (B)</p> Signup and view all the answers

What is the role of effectors in the nervous system?

<p>Respond to impulses sent by the nervous system (B)</p> Signup and view all the answers

What is the primary role of the auditory canal in the human ear?

<p>Direct sound waves to the tympanic membrane (eardrum) (B)</p> Signup and view all the answers

How can the division of the human nervous system into CNS and PNS be characterized?

<p>Voluntary and involuntary actions (D)</p> Signup and view all the answers

Which part of the human eye is responsible for maintaining the eyeball's shape?

<p>Choroid (C)</p> Signup and view all the answers

What is the purpose of binocular vision in humans?

<p>Provide depth perception (C)</p> Signup and view all the answers

Why is maintaining blood glucose levels within a tight range crucial for cellular function?

<p>To avoid fluctuations that can disrupt cellular metabolism (C)</p> Signup and view all the answers

What happens if carbon dioxide levels in the blood become too high?

<p>High CO2 levels disrupt enzyme activity and cellular functions (A)</p> Signup and view all the answers

Why is it important for human enzymes to operate within a narrow temperature range?

<p>To avoid impairment of enzyme function (D)</p> Signup and view all the answers

Which factor directly affects nerve impulse transmission, muscle contraction, and overall cellular function?

<p>Electrolyte balance like sodium and potassium levels (D)</p> Signup and view all the answers

What is the primary goal of negative feedback loops in homeostasis?

<p>To maintain stability by counteracting deviations from set points (A)</p> Signup and view all the answers

What is the function of the Eustachian tube in the human ear?

<p>To equalize pressure (A)</p> Signup and view all the answers

What is the role of the organ of Corti in the hearing process?

<p>Converting sound into nerve impulses (C)</p> Signup and view all the answers

How are hearing aids different from cochlear implants in treating deafness?

<p>Cochlear implants directly stimulate the auditory nerve (D)</p> Signup and view all the answers

What distinguishes endocrine glands from exocrine glands based on their secretion mode?

<p>Endocrine glands secrete hormones into the bloodstream (A)</p> Signup and view all the answers

Which system releases products through ducts either externally or into body cavities?

<p>Exocrine system (C)</p> Signup and view all the answers

What is the primary function of the motor neuron in a reflex arc?

<p>Transports the impulse from the spinal cord to the effectors (D)</p> Signup and view all the answers

During a reflex action, what is the role of the interneuron located in the spinal cord?

<p>Transmits the impulse from the sensory neuron to the motor neuron (D)</p> Signup and view all the answers

In a reflex arc, what is the function of the receptor?

<p>Receives a stimulus and converts it into an impulse (D)</p> Signup and view all the answers

What is one of the essential functions of a reflex action as mentioned in the text?

<p>Initiating automatic responses (C)</p> Signup and view all the answers

Which component of a reflex arc produces a response by contracting muscles or triggering gland secretion?

<p>Effector (B)</p> Signup and view all the answers

What is the primary function of the Islets of Langerhans in the pancreas?

<p>Secretion of insulin and glucagon (D)</p> Signup and view all the answers

Which hormone is responsible for preparing the body for 'fight or flight' responses?

<p>Adrenaline (D)</p> Signup and view all the answers

Where are oestrogen and progesterone primarily produced?

<p>Gonads (Ovaries) (C)</p> Signup and view all the answers

What is the primary function of aldosterone produced by the adrenal glands?

<p>Regulate sodium and potassium balance (C)</p> Signup and view all the answers

Which endocrine gland is essential for regulating metabolism, growth, and energy production in the body?

<p>Thyroid gland (C)</p> Signup and view all the answers

What is the key difference between positive feedback loops and negative feedback mechanisms?

<p>Positive feedback loops amplify responses, while negative feedback mechanisms restore balance. (C)</p> Signup and view all the answers

In the context of homeostasis, why is negative feedback more prevalent than positive feedback?

<p>Negative feedback is crucial for maintaining steady-state conditions. (C)</p> Signup and view all the answers

How does the body respond to high blood glucose levels according to negative feedback mechanisms?

<p>By releasing insulin to lower blood glucose levels. (B)</p> Signup and view all the answers

What is the role of the hypothalamus in maintaining thyroxin levels through negative feedback mechanisms?

<p>Decreasing TSH release when thyroxin levels are low. (B)</p> Signup and view all the answers

How does the body regulate blood salt levels using negative feedback mechanisms?

<p>By triggering aldosterone release to increase sodium reabsorption. (C)</p> Signup and view all the answers

How does the body respond to low blood glucose levels based on negative feedback mechanisms?

<p>By releasing glucagon to raise blood sugar levels. (C)</p> Signup and view all the answers

What initiates increased breathing rate and depth to restore blood pH balance?

<p>Increased CO2 concentration. (B)</p> Signup and view all the answers

How does the body restore water balance through osmoregulation?

<p>By adjusting ADH secretion to alter kidney water reabsorption. (A)</p> Signup and view all the answers

Why is thermoregulation important for the body?

<p>To maintain core temperature crucial for enzymatic processes. (A)</p> Signup and view all the answers

Which hormone plays a significant role in regulating metabolism, energy generation, and neural development?

<p>Thyroxin (B)</p> Signup and view all the answers

What is the function of the ciliary muscles in the human eye?

<p>Altering the shape of the lens for accommodation (A)</p> Signup and view all the answers

What is the role of the choroid in the human eye?

<p>Supplying nutrients and oxygen to the retina (C)</p> Signup and view all the answers

What is the primary function of the Optic Nerve in the human eye?

<p>Transmitting impulses from the retina to the brain (B)</p> Signup and view all the answers

In which part of the human eye would you find cones for bright light and color vision?

<p>Yellow Spot (Macula) (C)</p> Signup and view all the answers

What is the primary role of the Vitreous Humour in the human eye?

<p>Maintaining eyeball shape (C)</p> Signup and view all the answers

Why is it important for human enzymes to operate at a narrow temperature range around 37°C (98.6°F)?

<p>To prevent the denaturation of enzymes at extreme temperatures (C)</p> Signup and view all the answers

What role do hormones like insulin and glucagon play in maintaining blood glucose levels?

<p>Facilitating glucose uptake or release from energy stores (A)</p> Signup and view all the answers

Why is maintaining a balance between water and electrolytes crucial for nerve impulse transmission and muscle contraction?

<p>To ensure proper cellular function (C)</p> Signup and view all the answers

What is the primary function of negative feedback loops in homeostasis?

<p>Counteract deviations and return the system to its set point (C)</p> Signup and view all the answers

Why does the body activate mechanisms like vasodilation and sweating when body temperature rises?

<p>To promote heat loss and cool down to maintain optimal conditions (A)</p> Signup and view all the answers

Which gland is responsible for controlling sodium and potassium balance in the body?

<p>Adrenal glands (B)</p> Signup and view all the answers

How does the Eustachian tube contribute to the functioning of the human ear?

<p>Equalize pressure on both sides of the tympanic membrane (A)</p> Signup and view all the answers

What is the primary function of the Islets of Langerhans in the pancreas?

<p>Regulating blood glucose levels (A)</p> Signup and view all the answers

Which hormone is crucial for regulating metabolism, growth, and energy production?

<p>Thyroxine (A)</p> Signup and view all the answers

What is the role of the organ of Corti in the human ear?

<p>Convert sound into nerve impulses (B)</p> Signup and view all the answers

Which part of the inner ear is responsible for maintaining balance by detecting changes in body's speed and direction?

<p>Semi-circular canals (A)</p> Signup and view all the answers

What is the main function of cortisol in the body?

<p>Reducing inflammation (C)</p> Signup and view all the answers

How do cochlear implants differ from hearing aids in treating deafness?

<p>Directly transmit electrical impulses to the auditory nerve (A)</p> Signup and view all the answers

Which organs are responsible for producing oestrogen and progesterone?

<p>Gonads (Ovaries) (A)</p> Signup and view all the answers

What is the primary role of the Endocrine system in maintaining homeostasis?

<p>Regulate various bodily functions through chemical coordination (B)</p> Signup and view all the answers

What is the primary role of synapses in the reflex arc?

<p>Direct the nerve impulse through the correct pathway (C)</p> Signup and view all the answers

Which disease is characterized by progressive brain cell death and usually affects individuals over 60 years old?

<p>Alzheimer's Disease (B)</p> Signup and view all the answers

Which component of the nervous system is responsible for transmitting nerve impulses from receptors to the central nervous system?

<p>Neurons (D)</p> Signup and view all the answers

What is the primary function of effectors in the nervous system?

<p>Respond to impulses sent by the nervous system (C)</p> Signup and view all the answers

In the reflex arc, which type of neurons are responsible for activating the muscles to pull a hand away from a hot object?

<p>Motor Neurons (D)</p> Signup and view all the answers

What is the primary role of the interneuron in a reflex arc?

<p>Carries the impulse from the sensory neuron to the motor neuron (B)</p> Signup and view all the answers

Which component of a reflex arc directly produces the response to a stimulus?

<p>Effector (A)</p> Signup and view all the answers

What is the main function of a receptor in a reflex arc?

<p>Converts a stimulus into an impulse (A)</p> Signup and view all the answers

In a reflex arc, which component carries the impulse from the receptor to the spinal cord?

<p>Sensory Neuron (D)</p> Signup and view all the answers

What role does an effector play in a reflex action?

<p>Produces the response to a stimulus (D)</p> Signup and view all the answers

Which type of feedback loop is typically associated with events requiring a rapid outcome?

<p>Positive feedback (A)</p> Signup and view all the answers

In the context of homeostasis, what is more prevalent and crucial for maintaining steady-state conditions?

<p>Negative feedback (B)</p> Signup and view all the answers

What are disruptions in homeostasis most likely to lead to?

<p>Diseases and disorders (B)</p> Signup and view all the answers

Which of the following conditions reflects a failure in homeostatic regulation?

<p>Acidosis (B)</p> Signup and view all the answers

What is the primary purpose of negative feedback mechanisms in maintaining homeostasis?

<p>To restore balance (C)</p> Signup and view all the answers

Which hormone regulates metabolism, energy generation, and neural development by controlling thyroxin levels?

<p>Thyroid Stimulating Hormone (TSH) (D)</p> Signup and view all the answers

What triggers insulin release to facilitate glucose absorption by cells and lower blood sugar levels?

<p>High glucose levels (A)</p> Signup and view all the answers

How is blood pH balance restored when increased carbon dioxide lowers the pH?

<p>.Increased breathing rate and depth (B)</p> Signup and view all the answers

What are phytoalexins?

<p>Antimicrobial compounds synthesized in response to pathogen invasion (D)</p> Signup and view all the answers

Which plant defense structure makes it difficult for animals to reach leaves and softer parts without getting injured?

<p>Thorns (C)</p> Signup and view all the answers

What is the primary purpose of prickles on plants like rose bushes?

<p>To deter animals from eating the plant (A)</p> Signup and view all the answers

Which of the following is a mechanical plant defense strategy?

<p>Presence of thorns (A)</p> Signup and view all the answers

How do spines on plants like cacti contribute to their survival?

<p>By acting as a deterrent to herbivores (D)</p> Signup and view all the answers

In what ways do plant defenses help them compete successfully for resources?

<p>By deterring herbivores and limiting the spread of infections (A)</p> Signup and view all the answers

What is the purpose of studying plant defenses in agriculture?

<p>To develop strategies for pest and disease management (A)</p> Signup and view all the answers

How do scientists benefit from uncovering plant defense mechanisms?

<p>By revealing the complexity of plant biology and their ecological importance (A)</p> Signup and view all the answers

What is the role of volatiles organic compounds in plant defense?

<p>Deterring predators of herbivores (A)</p> Signup and view all the answers

What is the primary function of auxins in plant growth?

<p>Facilitating phototropism (C)</p> Signup and view all the answers

How do auxins contribute to apical dominance in plants?

<p>Inhibiting lateral bud growth (D)</p> Signup and view all the answers

Which plant hormone stimulates stem elongation, seed germination, and fruit enlargement?

<p>Gibberellins (B)</p> Signup and view all the answers

In which plant growth process do auxins play a crucial role?

<p>Facilitating apical dominance (A)</p> Signup and view all the answers

What is the primary function of abscisic acid (ABA) in plants?

<p>Preventing water loss during drought (C)</p> Signup and view all the answers

Where are auxins primarily produced in plants?

<p>Stem tips (A)</p> Signup and view all the answers

Which process is primarily regulated by gibberellins in plants?

<p>Flower formation (A)</p> Signup and view all the answers

How do synthetic auxins selectively kill broad-leaved weeds without harming grass or crops?

<p>By targeting the different hormone sensitivities of weeds and grass/crops (D)</p> Signup and view all the answers

In geotropism, what happens to auxins in response to gravity?

<p>They cause the lower side cells to elongate less. (B)</p> Signup and view all the answers

What is an essential function of gibberellins in plant growth?

<p>Inducing stem elongation (C)</p> Signup and view all the answers

How do auxins contribute to phototropism in plants?

<p>Inducing growth towards light (C)</p> Signup and view all the answers

What is one of the primary purposes of alkaloids produced by plants?

<p>To serve as antinutritional compounds (B)</p> Signup and view all the answers

What is the main function of gibberellins in relation to seed germination?

<p>Promoting early seedling growth after germination (D)</p> Signup and view all the answers

Why do plants have developed sophisticated defense mechanisms?

<p>To protect themselves against predators and environmental stresses (A)</p> Signup and view all the answers

What is the effect of removing the tip of a stem on lateral bud growth?

<p>Increased lateral bud growth due to auxin stimulation (C)</p> Signup and view all the answers

Which hormone is crucial for promoting seed dormancy and ensuring optimal germination conditions?

<p>Abscisic acid (ABA) (C)</p> Signup and view all the answers

What is the role of tannins in plant defense against herbivores?

<p>Binding to proteins and making them indigestible (D)</p> Signup and view all the answers

How do synthetic auxins aid in weed control without harming grass or crops?

<p>By exploiting hormone sensitivity differences between plant species (B)</p> Signup and view all the answers

What is one of the primary functions of synthetic auxins in weed management?

<p>Killing broad-leaved weeds selectively (B)</p> Signup and view all the answers

What is the primary function of auxins in plant growth?

<p>Regulate fruit development (C)</p> Signup and view all the answers

How do auxins contribute to phototropism in plants?

<p>Enhance cell elongation on the shaded side of the stem (C)</p> Signup and view all the answers

Which aspect of plant growth is primarily controlled by gibberellins?

<p>Seed germination (C)</p> Signup and view all the answers

What happens to lateral bud growth when auxins are actively produced at the stem's tip?

<p>It is inhibited (D)</p> Signup and view all the answers

How do plant hormones differ from animal hormones in terms of transportation?

<p>Animal hormones act where they are produced (B)</p> Signup and view all the answers

What is the role of gibberellins in fruit enlargement in plants?

<p>Stimulate cell division in the fruit (C)</p> Signup and view all the answers

Which process is primarily regulated by auxins in plants?

<p>Root elongation (C)</p> Signup and view all the answers

What effect does removing the tip of a plant stem (source of auxins) have on lateral bud growth?

<p>It promotes lateral bud growth (A)</p> Signup and view all the answers

Which plant hormone is primarily responsible for the process of apical dominance?

<p>Auxins (C)</p> Signup and view all the answers

How do gibberellins contribute to stem elongation in plants?

<p>Stimulate cell expansion and elongation (A)</p> Signup and view all the answers

What is the role of gibberellins in plants?

<p>Promote flowering and fruit development (C)</p> Signup and view all the answers

What is the primary function of Abscisic Acid (ABA) in plants?

<p>Promote seed dormancy (D)</p> Signup and view all the answers

What is the function of phytoalexins in plants?

<p>Synthesizing antimicrobial compounds in response to pathogens (C)</p> Signup and view all the answers

How do synthetic auxins contribute to weed control in agriculture?

<p>Kill weeds without harming crops (D)</p> Signup and view all the answers

How do prickles on plants like rose bushes primarily function as a defense mechanism?

<p>Creating a mechanical barrier against herbivores (C)</p> Signup and view all the answers

What is the main function of auxins in geotropism?

<p>Promote downward growth of roots (B)</p> Signup and view all the answers

Which plant defense mechanism involves reducing the surface area of leaves and minimizing water loss?

<p>Modification of leaves into spines (D)</p> Signup and view all the answers

Which process involves auxins accumulating on the shaded side of a plant?

<p>Phototropism (D)</p> Signup and view all the answers

What is the primary role of volatile organic compounds produced by plants?

<p>Attracting predators or parasitoids of herbivores (A)</p> Signup and view all the answers

What is the primary role of alkaloids in plants' chemical defenses?

<p>Deter herbivores through toxicity (B)</p> Signup and view all the answers

How do thorns differ from spines in terms of their structure and function in plants?

<p>Thorns are sharp outgrowths from the epidermis, while spines are modified stems (D)</p> Signup and view all the answers

Which defense mechanism makes it difficult for insects and herbivores to navigate plant surfaces and consume tissues?

<p>Secretion of sticky or slippery substances (D)</p> Signup and view all the answers

How do tannins contribute to plant defense against herbivores?

<p>Decrease nutritional value of plant tissue (C)</p> Signup and view all the answers

What is the purpose of thorns on a plant like a rose bush?

<p>Providing a mechanical barrier against herbivores (A)</p> Signup and view all the answers

What is a common feature of plants' chemical defenses against pathogens?

<p>Antimicrobial activity (D)</p> Signup and view all the answers

How do plants benefit from their structural and chemical defense mechanisms?

<p>Enhanced reproductive success (B)</p> Signup and view all the answers

How do prickles on plants like rose bushes primarily contribute to plant defense?

<p>Deterring herbivores from consuming the plant (D)</p> Signup and view all the answers

What is the main function of mechanical defenses like thorns, spines, and prickles in plants?

<p>Serving as physical barriers against large herbivores (B)</p> Signup and view all the answers

What is the selective herbicide action of synthetic auxins based on?

<p>Difference in hormone sensitivity between weeds and grass (C)</p> Signup and view all the answers

Which plant hormone is involved in breaking seed dormancy and promoting germination?

<p>Gibberellins (B)</p> Signup and view all the answers

What is the role of Abscisic Acid (ABA) in promoting seed dormancy?

<p>Ensuring seeds only germinate under optimal conditions (C)</p> Signup and view all the answers

Which hormone is often termed the 'stress hormone' in plants and is involved in reducing water loss during drought?

<p>Abscisic Acid (A)</p> Signup and view all the answers

In the control of weeds using plant hormones, applying synthetic auxins selectively kills broad-leaved weeds because:

<p>Weeds are more sensitive to auxins than grass or crops (C)</p> Signup and view all the answers

Which plant hormone plays a central role in geotropism by causing differential elongation of cells?

<p>Auxins (B)</p> Signup and view all the answers

What is the primary function of chemical compounds like alkaloids and tannins produced by plants?

<p>To deter herbivores and pathogens (B)</p> Signup and view all the answers

Which group of chemical compounds binds to proteins and makes them indigestible to animals?

<p>Tannins (C)</p> Signup and view all the answers

What is the primary function of auxins in plants?

<p>Stimulate stem elongation (D)</p> Signup and view all the answers

What is the main function of gibberellins in plants?

<p>Promote fruit enlargement (C)</p> Signup and view all the answers

In terms of apical dominance, what happens when auxins are reduced at the stem's tip?

<p>Lateral buds grow taller (D)</p> Signup and view all the answers

Where are auxins primarily produced in plants?

<p>Root tips (A)</p> Signup and view all the answers

What is the role of auxins in geotropism in plants?

<p>Enhance response to gravity (D)</p> Signup and view all the answers

How do gibberellins contribute to seed germination?

<p>Promote root elongation (A)</p> Signup and view all the answers

Which plant hormone stimulates stem elongation and fruit enlargement?

<p>Gibberellins (B)</p> Signup and view all the answers

What is the primary function of plant hormones known as cytokinins?

<p>Encourage cell division (B)</p> Signup and view all the answers

What is the role of phytoalexins in plants?

<p>Synthesizing compounds that kill pathogens (D)</p> Signup and view all the answers

How do sticky or slippery substances on some plants' surfaces contribute to their defense?

<p>Making it difficult for insects to consume plant tissues (C)</p> Signup and view all the answers

Which plant defense mechanism involves producing volatile organic compounds?

<p>Volatile toxic fumes (A)</p> Signup and view all the answers

What is the purpose of thorns as a plant defense strategy?

<p>To make it difficult for animals to reach leaves without getting injured (A)</p> Signup and view all the answers

In plant defense structures, what distinguishes prickles from thorns?

<p>Prickles are outgrowths from epidermis or cortex, thorns are modified branches or stems (D)</p> Signup and view all the answers

How do spines on plants such as cacti contribute to their survival?

<p>By reducing leaf surface area and deterring herbivores with sharpness (D)</p> Signup and view all the answers

Why is understanding plant defense mechanisms crucial for agriculture?

<p>&quot;To reduce the need for chemical pesticides&quot; (D)</p> Signup and view all the answers

What is the primary purpose of mechanical defenses employed by plants?

<p>To protect against herbivores and environmental stressors (A)</p> Signup and view all the answers

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