Biology U3 L02 Body Plans And Adaptations

Front 1

Compare and contrast radial and bilateral symmetry in animals. Give an example of each type.

Back 1

radial symmetry- can be divided along any plane into equal halves; hydra; bilateral symmetry- can be divided only along one plane to form two equal halves; flatworm

Front 2

Distinguish between the body plan of an acoelomate and a coelomate. Give an example of an animal with each type of body plan.

Back 2

Acoelomates, such as flatworms, have three cell layers with a digestive tract but no body cavity. Coelomates, such as earthworms, have a coelom in which internal organs are suspended.

Front 3

Explain how an adaptation such as an exoskeleton could be an advantage to animals in land biomes.

Back 3

An exoskeleton prevents water loss from body organs and supports an animal’s body on land.

Front 4

Compare movement in acoelomate and coelomate animals.

Back 4

Acoelomates have no body cavity, whereas coelomates can brace their muscles against the coelom, giving them more powerful movements.

Front 5

Explain the relationship between having a coelom and the development of complex organ systems.

Back 5

The coelom provides space for specialized organs and organ systems.

Front 6

a term that describes the arrangement of body structures.

Back 6

symmetry

Front 7

an animal's body plan that can be divided along any plane, through a central axis, into roughly equal halves

Back 7

radial symmetry

Front 8

animals with a body plan that can be divided down its length into two similar right and left halves that form mirror images of each other.

Back 8

bilateral symmetry

Front 9

head end of bilateral animals where sensory organs are often located.

Back 9

anterior

Front 10

tail end of bilaterally symmetric animals.

Back 10

posterior

Front 11

upper surface of bilaterally symmetric animals

Back 11

dorsal

Front 12

lower surface of bilaterally symmetric animals

Back 12

ventral

Front 13

an animal with no body cavities (flatworm)

Back 13

acoelomate

Front 14

fluid-filled body cavity partly lined with mesoderm.

Back 14

pseudocoelom

Front 15

fluid-filled body cavity completely surrounded by mesoderm.

Back 15

coelom

Front 16

hard covering on the outside of some animals, including spiders and mollusks; provides a framework for support, protects soft body tissues, and provides a place for muscle attachment.

Back 16

exoskeleton

Front 17

animal that does not have a backbone

Back 17

invertebrate

Front 18

internal skeleton; provides support, protects internal organs, and acts as an internal brace for muscles to pull against.

Back 18

endoskeleton

Front 19

an animal with an endoskeleton and a backbone

Back 19

vertebrate