NEET 2010 Biology question

Which one of the following statements about all the four of Spongilla, Leech, Dolphin and Penguin is correct

(1)Leech is a fresh water form while all others are marine
(2)Spongilla has special collared cells called choanocytes, not found in the remaining threeCorrect
(3)All are bilaterally symmetrical
(4)Penguin is homoiothermic while the remaining three are poikilothermic

Answer: (2)

Solution

Spongilla is a freshwater sponge (Porifera); sponges have a canal system lined by flagellated collared cells called choanocytes (collar cells) that create the water current. Leech (Annelida), dolphin (mammal) and penguin (bird) do not have choanocytes. So (2) is correct. (1) is wrong: Spongilla is

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Question ID VK-090624