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

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

Correct answer: Spongilla has special collared cells called choanocytes, not found in the remaining three

Solution

Spongilla is a sponge (phylum Porifera), and sponges possess choanocytes, or collar cells, used in feeding and water flow. Leech, dolphin, and penguin do not have choanocytes, so this statement is the correct one.

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