NEETBiologyAnimal KingdomMCQ+4 / −1
Which one of the following statements about all the four of Spongilla, leech, dolphin and penguin is correct?
- APenguin is homoiothermic while the remaining three are poikilothermic.
- BLeech is a fresh water form while all others are marine.
- CSpongilla has special collared cells called choanocytes, not found in the remaining three. All arebilaterally symmetrical.
- DAll are bilaterally symmetrical.
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Correct answer: C
Spongilla is a common, widely distributed fresh water sponge belonging to phylum porifera. Canal system in Spongilla is essentially of rhagon type with choanocytes restricted to small rounded chambers. It is not found in leech, dolphin and penguin.
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