29. Sponges with the least filtering capacity (relative to their overall size) p

Question

29. Sponges with the least filtering capacity (relative to their overall size) possess which body form? A. syconoid B. placoid C. leuconoid D. osculoid E. asconoid 30. Schistosomiasis is a parasitic disease that is prevalent in many areas of the world and caused by a A. planarian worm B. cestode C. roundworm D. fluke E. leech 31. Monoecious organisms are seen among the A. Cestoda B.Oligochaeta C. Turbellaria D. only choices A & B E. Choices A, B & C apply. 32. Which geological period represents a time when there was a relative "explosion" in the evolution of numerous animal phyla? C. Devonian D. Cretaceous E. Ordovician A. Carboniferous 33. A small organism has proportionally less surface area relative to its inner volume than a larger organism. 34. Coral bleaching arises when corals lose their . B. Cambrian A. True B. False A. zooxanthellae B. choanoflagellatesC. nematocysts D. cnidae E. mesohyl 35. Sponges are classified into taxonomic classes on the basis of their A. type of spongin fibers B. type of spicules C. type of body plan D.type of oscula (no 'E") 36. In which molluscs are the ctenidia NOT used exclusively (only) for gas exchange? A. snails B. clams C. chambered nautilus D. squid E. nudibranchs 7. The evolution of tripoblastic embryos first appeared among the A. Cnidaria B. Annelida C. Porifera D. Platyhelminthes E. Nematoda

Explanation / Answer

29) E. The asconoid sponges have most primitive type of canal system with least filtering capacity.

30) D. Schistosomiasis is caused by blood fluke schistosomes.

31) E. Monoecious organisms are found in all three indicated parasites.

32) B. Cambrian period is period where evolutionary explosion in animal phyla occured.

33) B. false. small organism have less surface area than body volume.

34) A. Coral bleaching occurs when coral loose their zooxanthellae.

35) B. sponges are classified on the basis of skeleton of which spicules form the major part.

36) B. clams have ctenidia where it performs gas exchange and capture of food particle.

37) D. The triploblastic embryos first appeared in platyhelminthes.

34)

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