20) The coelom of a lophophorate is divided into a) two parts: the anteriocoel a
ID: 3477374 • Letter: 2
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20) The coelom of a lophophorate is divided into a) two parts: the anteriocoel and posteriocoel. b) three parts: the protocoel, mesocoel, and metacoel. c) four parts: the left and right supracoel and subcoel. d) two parts: the basicoel and the exterocoel extending into the tentacles e) an interior hypocoel and a surrounding pericoel. 21) Ectoprocta a) live in both marine and freshwater habitats. b) form colonies. c) resemble cnidarian hydroids. d) excludes the entoprocts e) All of these choices are correct 22) Which arose first in Gastropods, coiling or torsion? a) coiling b) torsion both arose at the same time neither is seen in gastropods d) 23) Ctenidia are: a) used for nitrogenous waste removal b) complex sensory organs c) present in all molluscs d) used for gas exchange e) both B & C t Both C &D; g) None of the above 24) The more advanced prosobranchs have only one in their mantle cavity. a) shell b) foot c) ctenidia d) radula e) tentacle 25) Coiling in gastropods a) occurs at the same time as torsion b) only occurs in Opisthibranchia c) occurs when the visceral mass rotates counterclockwise during larval development d) occurs when the mantle secretes more calcium carbonate on one side of the body versus the otherExplanation / Answer
20; The coelom of a lophophorate is divided into three parts protocoel, mesocoel and metacoel.
21; Ectoprocta
So the answer is all of the above
22; Torsion and coiling occurs at the same time (larval stage) but of different origin.
23;ctenidia is used for gas exchange; aquatic molluscs respire through ctenidia
24; The advanced prosobranchs have only one tentacle in their mantle cavity
25; Coiling in gastropods occurs at the same time as torsion
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