Biology, Eighth Edition (Raven)

Chapter 33: Noncoelomate Invertebrates

Pre Test

The traditional classification of the animals divides the bilaterally symmetrical animals into three branches based on: (p .637 )
B)mode of nutrition.
C)type of embryological cell division.
D)type of body cavity.
E)all of the above
Sponge cells differ from those of other animals because: (p. 638)
A)they have unique organelles called nematocysts.
B)they lack a cell wall.
C)they are able to differentiate into other cell types and to dedifferentiate.
D)the cells can exist in a solitary state.
E)a and b
Cnidaria (jellyfish, corals, etc.) differ from other organisms because: (p. 641)
A)they have unique, specialized cells called cnidocytes.
B)some can undergo either sexual or asexual reproduction.
C)some members secrete calcareous skeletons.
D)some show bioluminescence.
E)all of the above
The free-living flatworms (Turbellaria) are small (a few mms in length), and have flat, thin bodies. This is because: (p. 645)
A)they are limited in size because they lack a coelom.
B)of the habitat in which they occur.
C)gas exchange must be by diffusion as they lack a circulatory system.
D)a and c
E)none of the above
The pseudocoelom: (p. 648 - 650)
A)has evolved independently in different groups.
B)acts as a hydrostatic skeleton.
C)limits body size.
D)has three chambers.
E)a and b
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