NEET Biology question

Which one of the following statements about the four, *Spongilla,* leech, dolphin and penguin is correct?

(A)Penguin is homeothermic, while the remaining three are poikilothermic
(B)Leech is a freshwater form, while all others are marine
(C)*Spongilla* has special collar cells called choanocytes, which are not found in the remaining threeCorrect
(D)All are bilaterally symmetrical animals

Answer: (C)

Solution

Choanocytes (collar cells) are unique to sponges such as Spongilla and are absent in leech, dolphin and penguin, making option (c) correct. Option (a) is wrong because dolphin, being a mammal, is also homeothermic; option

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Question ID VK-105858