Reproduction in Animals

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Questions and Answers

What is the result of fertilization in animals?

  • Formation of a zygote (correct)
  • Laying of eggs
  • Release of sperms
  • Development of an embryo

All eggs laid by animals are fertilized and develop into new individuals.

False (B)

Why is it necessary for animals to produce a large number of eggs and sperms?

To ensure the successful fertilization of at least a few eggs, given the challenges like exposure to water movement, wind, rainfall, and predation.

The developing structure within the uterus is called an ______.

<p>embryo</p> Signup and view all the answers

Match the following terms with their corresponding definitions:

<p>Zygote = The initial stage of development following fertilization Embryo = The developing structure within the uterus Fertilization = The process of union between sperm and egg Tissue = A group of similar cells performing a specific function</p> Signup and view all the answers

Which of the following animals is an example of an oviparous animal?

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

Internal fertilization occurs in hens.

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

What is the name given to the protective layer that forms around the developing embryo in a hen's egg?

<p>Hard shell</p> Signup and view all the answers

The process of an embryo developing inside an egg outside the mother's body is called ______.

<p>oviparity</p> Signup and view all the answers

Which of the following statements is TRUE about viviparous animals?

<p>They give birth to live young. (C)</p> Signup and view all the answers

The developing embryo in a hen's egg takes about 3 weeks to develop into a chick.

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

What is the name given to the young stage of a frog that lives in water and breathes through gills?

<p>Tadpole</p> Signup and view all the answers

Match the following animals with their reproductive strategy:

<p>Hen = Oviparous Cow = Viviparous Lizard = Oviparous Cat = Viviparous</p> Signup and view all the answers

Animals that give birth to live young are called ______ animals.

<p>viviparous</p> Signup and view all the answers

What is the process of reproduction that involves the fusion of male and female gametes called?

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

Dolly the sheep was a clone of a Scottish blackface ewe.

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

The fusion of an ovum and sperm is called ______.

<p>fertilization</p> Signup and view all the answers

What is the name given to the fertilized egg?

<p>Zygote</p> Signup and view all the answers

Which of the following animals reproduce through internal fertilization?

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

External fertilization occurs inside the female's body.

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

The repeated division of a zygote gives rise to an ______.

<p>embryo</p> Signup and view all the answers

What are the two main types of reproduction in animals?

<p>Sexual and Asexual reproduction</p> Signup and view all the answers

Dolly the sheep lived a long and healthy life.

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

The transformation of a larva into an adult through drastic changes is called ______.

<p>metamorphosis</p> Signup and view all the answers

Human beings undergo metamorphosis just like frogs.

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

Which of the following is NOT a distinct stage in the life cycle of a frog?

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

Describe the appearance of a tadpole compared to an adult frog.

<p>Tadpoles are aquatic, have tails, lack legs, and have gills for breathing underwater. Adult frogs are terrestrial, have legs for hopping, lack tails, and have lungs for breathing air.</p> Signup and view all the answers

Match the following terms with their definitions:

<p>Metamorphosis = A type of reproduction involving only one parent Asexual Reproduction = A biological process of significant physical changes Budding = A form of asexual reproduction in hydra Larva = The early stage of an organism's development after hatching from an egg</p> Signup and view all the answers

Which of the following is an example of asexual reproduction?

<p>A hydra producing buds (C)</p> Signup and view all the answers

All animals undergo metamorphosis during their life cycle.

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

How does budding occur in hydra?

<p>Budding in hydra involves the development of a small outgrowth called a bud on the parent's body. The bud grows and eventually detaches, becoming a new, independent hydra.</p> Signup and view all the answers

The new individuals developing as outgrowths from the parent body in hydra are called ______.

<p>buds</p> Signup and view all the answers

Yeast and hydra both exhibit asexual reproduction.

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

Fertilization is essential for both asexual and sexual reproduction.

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

Which of the following is NOT a method of asexual reproduction in animals?

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

The ______ is the stage of development in which the embryo becomes embedded in the uterus.

<p>embryo</p> Signup and view all the answers

What is the primary difference between a zygote and a foetus?

<p>A zygote is a single cell formed by the fusion of a sperm and egg, while a foetus is a more developed multicellular organism.</p> Signup and view all the answers

Flashcards

Viviparous Animals

Animals that give birth to live young ones instead of laying eggs.

Oviparous Animals

Animals that lay eggs from which young hatch.

Internal Fertilization

Fertilization that occurs inside the body of the female.

Zygote

The fertilized egg that undergoes cell divisions.

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Embryo

An early developmental stage of the organism, after the zygote stage and before birth.

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Protective Layer

Layers that form around developing embryos, like the hard shell of an egg.

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Development Time

The period it takes for an embryo to develop into a young creature; for chicks, it's about 3 weeks.

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Chick Hatching

The process in which a chick emerges from its egg after development.

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Examples of Viviparous Animals

Mammals like humans, cows, dogs, and cats that give birth to live young.

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Fertilisation

The process where sperm and egg unite to form a zygote.

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Development of Embryo

The process where the zygote divides and develops into tissues and organs.

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Eggs and Sperm Production

Animals produce many eggs and sperms to increase chances of fertilisation.

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Environmental Factors in Reproduction

Wind, water movement, and other animals can impact fertilisation rates.

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Uterus

The organ where the embryo embeds and continues to develop in some animals.

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Metamorphosis

The transformation of larvae into adults through drastic changes.

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Tadpole

The larval stage of a frog, which looks different from the adult.

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Life Cycle of Frog

Stages include egg, tadpole, and adult frog.

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Asexual Reproduction

Reproduction involving only one parent, producing new individuals.

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Budding

A process where new individuals develop as outgrowths from a parent.

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Egg Stage

The initial stage in the life cycle of a frog.

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Hydra

A small organism that reproduces asexually by budding.

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Growth Stages

Stages of development from young ones to adults.

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Parent Body

The organism from which new individuals develop in asexual reproduction.

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Distinct Stages

Clear and separate phases in an organism's life cycle.

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Dolly

The first mammal cloned from an adult somatic cell, a Finn Dorsett sheep.

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Cloning

The process of creating a genetically identical copy of an organism.

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Gametes

Reproductive cells (sperms in males, ova in females) that fuse during fertilisation.

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External fertilisation

Fertilisation that occurs outside the female body, common in aquatic animals.

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Binary fission

A method of asexual reproduction where an organism splits into two.

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Study Notes

Reproduction in Animals

  • Reproduction is crucial for species continuation
  • Animals reproduce through sexual or asexual methods
  • Sexual reproduction involves fusion of male and female gametes (ova and sperm), forming a zygote.
  • Sexual reproduction can be either internal or external.
  • Internal fertilization occurs inside the female body. Examples: humans, cows, dogs, and hens.
  • External fertilization occurs outside the female body in water. Example: frogs, fish.
  • Asexual reproduction involves a single parent. Example: Hydra, budding.
  • Another asexual reproduction method is binary fission, where a single-celled organism divides into two. Example: Amoeba.
  • Reproduction produces similar individuals through generations.

Modes of Reproduction

  • Animals can reproduce sexually or asexually.
  • Viviparous animals give birth to live young. Example: human beings, cows, dogs
  • Oviparous animals lay eggs that develop outside the mother's body. Example: hens, frogs.
  • Animals reproduce in different ways to adapt to different environments.

Male Reproductive Organs

  • The male reproductive organs include testes, sperm ducts, and penis.
  • Testes produce sperms (male gametes).
  • Sperms are single cells with head, mid-piece, and tail.

Female Reproductive Organs

  • The female reproductive organs include ovaries, oviducts (fallopian tubes), and uterus.
  • Ovaries produce ova (female gametes).
  • Ova are also single cells.

Fertilization

  • Fertilization is the fusion of sperm and ovum.
  • Internal fertilization occurs inside the female body.
  • External fertilization occurs outside the female body.

Development of Embryo

  • Fertilization leads to zygote formation.
  • The zygote develops into an embryo.
  • Embryos eventually develop into young ones.
  • Development occurs inside or outside the female body.

Viviparous and Oviparous Animals

  • Viviparous animals give birth to live young. Example: humans
  • Oviparous animals lay eggs. Example: hens
  • Different animals have different reproductive strategies that are often adapted to their environment.

Asexual Reproduction

  • Asexual reproduction involves a single parent.
  • Budding is a type of asexual reproduction, where new individuals develop from buds on the parent. Example: hydra
  • Binary fission is a type of asexual reproduction where the parent divides into two individuals. Example: amoeba.

Cloning

  • Cloning is producing genetically identical copies (clones) of living organisms.
  • Dolly the sheep was one of the first cloned mammals.

Life Cycle of Frogs

  • Frogs undergo metamorphosis (a drastic change in form) during their life cycle.
  • The frog's life cycle progresses from egg to tadpole to adult (frog).

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