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

Question

22. Which correctly describes the evolutionary origin and adaptive radiation of molluses? A Molluscs originated in freshwater and invaded both terrestrial and marine environments Molluscs originated on land, all classes then invaded both freshwate ted on land, all classes then invaded freshwater and the bivalves and gastropods invaded marine and marine environments environments Moll uscs originated in the sea E. vaded the land cs originated in the sea, bivalves and gastropods invaded brackish and freshwater environments, and just gastropods and nsome moluses, the free-swimming larva is a trochophore while in others, it i a veliger with the beginnings of a foot, she A A veliger is found strictly in terrestrial molluscs e trochophore is considered ancestral and the veliger is a derived larval stage C. The two larval forms 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 molluscs have a trochophore stage enophores 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 Ethey could find cnidocytes in polychaetes and collect them 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 differ? A. in terms of the number of tissue layers B. in terms of body symmetry n terms of number of openings to the gut D) a & b E. a, b &c; 27. The monogenetic flukes A 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

Ans 22) Mollusca originated from the sea, bivalves and gastropods invaded brackish and fresh water environments and only gastropods invaded the land.

Explain- It is only found from the fossils that gastropods have all the marine character and present in the high mountains. They are the only mollusca found in the land.

Ans 23) The trophocore is considered ancestral and veliger is derived larva stage.

Explain- Veliger develops from the trophocore.

Ans 25) Eating insufficiently cooked food.

Explain- Tapeworm larva is present in the muscle of these animals. If raw or uncooked food is taken then the larva is alive and can infect the human body.

Ans 27) are mostly ectoparasites.

Explain- Monogenetics flukes are ectoparasite because they live outsides of their body of their hostis body.

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