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Question

Choanocytes form the lining of the para-gastral cavity in

A
jellyfish
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B
sponges
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C
flatworms
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D
starfish
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Solution

The correct option is B sponges
Paragastral cavity is another term for spongocoel which is common to all sponges. It is lined by endodermal cells, which contains a single layer of collared, flagellated cells, called choanocytes. Choanocytes generate water currents. It helps in capturing food and also in capturing sperm for fertilization.

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