10 Questions
What is the main purpose of the levels of organization in animal bodies?
To enable animals to meet their basic needs
Which of the following is NOT one of the basic needs that animals must meet?
Maintaining social status
What is the characteristic of an animal that displays radial symmetry?
It has body parts arranged around a central axis
Which phylum of worms is characterized by the presence of setae (bristles)?
Annelida
What is the importance of coral reefs?
They support a diverse range of marine life
At which level of organization do organs combine to perform specific functions in an animal body?
Organ system
What is the primary function of the four basic needs that animals must meet?
To survive and reproduce
What is the characteristic of an animal that displays bilateral symmetry?
Having a mirror image on both sides of a central axis
What is a characteristic of sponges?
Having a porous body
What is a characteristic of cnidarians?
Having stinging cells called cnidoblasts
Study Notes
Levels of Organization in Animal Bodies
- Organism: a single animal
- Organ system: a group of organs working together to perform specific functions
- Organ: a structure composed of two or more types of tissues that work together to perform specific functions
- Tissue: a group of similar cells that perform a specific function
- Cell: the basic structural and functional unit of life
Functions to Meet Basic Needs
- Obtaining and digesting food
- Circulating nutrients and oxygen
- Removing waste products
- Responding to stimuli and adapting to the environment
Classification of Animals
- Based on characteristics such as body structure, development, and evolutionary relationships
- Classified into kingdoms, phyla, classes, orders, families, genera, and species
Symmetry
- The arrangement of body parts around a central axis
- Bilateral symmetry: body can be divided into two identical halves by a single plane
- Radial symmetry: body parts are arranged around a central axis, like the spokes of a wheel
- Asymmetrical: no symmetry
Characteristics Based on Symmetry
- Bilateral symmetry: suggests sensory organs, movement, and complex behavior
- Radial symmetry: suggests a sedentary or slow-moving lifestyle
- Asymmetrical: suggests simple body structure and limited movement
Characteristics of Sponges
- Simple multicellular animals
- Porous body with specialized cells for filtering food and water
- No nervous system or sensory organs
- Three classes: Calcarea, Hexactinellida, and Demospongiae
Characteristics of Cnidarians
- Simple multicellular animals
- Radial symmetry
- Two body forms: polyp and medusa
- Classes: Cubozoa (box jellyfish), Scyphozoa (true jellyfish), Anthozoa (sea anemones and corals), and Hydrozoa (hydroids and hydras)
Importance of Coral Reefs
- Home to diverse marine life
- Protect coastlines from erosion and wave damage
- Support commercial fisheries and tourism
- Provide medicinal and scientific discoveries
Phyla of Worms
Platyhelminthes (Flatworms)
- Flat, ribbon-like body
- No body cavity
- Classes: Turbellaria (free-living), Monogenea (ectoparasites), and Cestoda (tapeworms)
Annelids (Segmented Worms)
- Body divided into segments
- Body cavity present
- Classes: Polychaeta (marine worms) and Clitellata (earthworms)
Nematodes (Roundworms)
- Long, slender body
- Round in cross-section
- Classes: Chromadorea (parasitic) and Enoplea (free-living)
Levels of Organization in Animal Bodies
- Organism: a single animal
- Organ system: a group of organs working together to perform specific functions
- Organ: a structure composed of two or more types of tissues that work together to perform specific functions
- Tissue: a group of similar cells that perform a specific function
- Cell: the basic structural and functional unit of life
Functions to Meet Basic Needs
- Obtaining and digesting food
- Circulating nutrients and oxygen
- Removing waste products
- Responding to stimuli and adapting to the environment
Classification of Animals
- Based on characteristics such as body structure, development, and evolutionary relationships
- Classified into kingdoms, phyla, classes, orders, families, genera, and species
Symmetry
- The arrangement of body parts around a central axis
- Bilateral symmetry: body can be divided into two identical halves by a single plane
- Radial symmetry: body parts are arranged around a central axis, like the spokes of a wheel
- Asymmetrical: no symmetry
Characteristics Based on Symmetry
- Bilateral symmetry: suggests sensory organs, movement, and complex behavior
- Radial symmetry: suggests a sedentary or slow-moving lifestyle
- Asymmetrical: suggests simple body structure and limited movement
Characteristics of Sponges
- Simple multicellular animals
- Porous body with specialized cells for filtering food and water
- No nervous system or sensory organs
- Three classes: Calcarea, Hexactinellida, and Demospongiae
Characteristics of Cnidarians
- Simple multicellular animals
- Radial symmetry
- Two body forms: polyp and medusa
- Classes: Cubozoa (box jellyfish), Scyphozoa (true jellyfish), Anthozoa (sea anemones and corals), and Hydrozoa (hydroids and hydras)
Importance of Coral Reefs
- Home to diverse marine life
- Protect coastlines from erosion and wave damage
- Support commercial fisheries and tourism
- Provide medicinal and scientific discoveries
Phyla of Worms
Platyhelminthes (Flatworms)
- Flat, ribbon-like body
- No body cavity
- Classes: Turbellaria (free-living), Monogenea (ectoparasites), and Cestoda (tapeworms)
Annelids (Segmented Worms)
- Body divided into segments
- Body cavity present
- Classes: Polychaeta (marine worms) and Clitellata (earthworms)
Nematodes (Roundworms)
- Long, slender body
- Round in cross-section
- Classes: Chromadorea (parasitic) and Enoplea (free-living)
This quiz covers the organization of animal bodies, functions that meet basic needs, classification, symmetry, and characteristics of sponges, cnidarians, and worms.
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