Biology, Eighth Edition (Raven)

Chapter 33: Noncoelomate Invertebrates

Post Test

1
The modern classification of the animals has divided the protostomes into two clades: (p .637 )
A)platyzoa/lophotrochozoans.
B)spiralia/lophotrochozoans.
C)ecdysozoa/platyzoa.
D)spiralia/ecdysozoa.
E)acoelomates/eucoelomates.
2
Sponges are filter feeders. The cells that draw water into the sponge are called: (p. 639)
A)archeocytes.
B)amoebocytes.
C)choanocytes.
D)choanoflagellates.
E)cnidocytes.
3
A major evolutionary innovation seen in cnidaria, compared with sponges, is: (p. 641)
A)the evolution of the nematocysts.
B)some can undergo either sexual or asexual reproduction.
C)some members secrete calcareous skeletons.
D)some show bioluminescence.
E)extracellular digestion of food.
4
Most parasites are extremely specialized and show many adaptations for a parasitic way of life. From an evolutionary point of view, why will it be impossible to completely eliminate parasites? (p. 646)
A)There are just too many.
B)It is an evolutionary "arms race"; parasites are always under stronger selection than the host to evolve defenses.
C)It will be possible to completely eliminate parasites.
D)none of the above
5
In some species of nematode the adults consist of a fixed number of cells. This is known as: (p. 649)
A)eutrophy.
B)eutely.
C)homosis.
D)constancy.
E)numeracy.
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