22. Which correctly describes the evolutionary origin and adaptive radiation of

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22. Which correctly describes the evolutionary origin and adaptive radiation of molnments uscs origin Molluscso ated in freshwater and invaded both terrestrial and marine oiginated on land, all classes then invaded both freshwater and marine environments s originated on land, all classes then invaded freshwater and the bivaives and gastropods Invaded marine environments Molluscs originated in the sea, both bivalves and gastropods invaded marine environments and the land vaded the land riginated in the sea, bivalves and gastropods invaded brackish and freshwater environments, and just gastropods In some molluscs, the free and mantle. What is the relationship of these molluscan juvenile stages? -swimming larva is a trochophore while in others, it is a veliger with the beginnings of a foot, shell A veliger is found strictly in terrestrial molluscs trochophore is considered ancestral and the veliger is a derived larval stage C. The two larval f orms represent two early and distinct branches of molluscs D. The veliger is ancestral and the trochophore is a derived larval stage E. Only the cephalopods have the veliger stage; all other molluses have a trochophore stage 24. Ctenophores belong to a phylum we did not study in depth. They are small free-swimming, radially symmetrical marine animals. They were once classified as cnidarians because cnidocytes were sometimes found inside of them. From what you know about animal biology, why might they have cnidocytes if they can't make them? they could take the cnidocytes in when they pump seawater they could feed on medusa and save the cnidocytes as a defense A. they could feed on sponges and modify the choanocytes into cnidoytes D they are probably feeding on snails that harvest the cnidocytes E they could find cnidocytes in polychaetes and collect thenm How could you become infected with adult tapeworms? Eating insufficiently cooked pork B. Being bitten by a mosquito C. Ingesting eggs in contaminated water D. Eating freshly peeled fruit E. All of choices are correct 26. Tube dwelling polychaetes look similar to some sea anemones, especially those that bury themselves in the mud.Both animals have tentacles on their heads, but how might the rest of their bodies difer? A. in terms of the number of tissue layers B. in terms of body symmetry Cin terms of number of openings to the gut D) a & b E. a, b & c 27. The monogenetic flukes are mostly ectoparasites. B. are usually found in rabbits. C require an intermediate and a definitive host. D. All of the choices are correct E None of the choices are correct

Explanation / Answer

Ans22:

Molluscs show a good eg of adaptive radiation, leading to rise of a various species in specific microenvironment.

Molluscs originated in sea, and only gastropods invaded land.

Thus, option E should be correct.

23: B

24: B

25: A

26: D

27: A

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