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Question

The Choanocytes in a syncoid type of sponge are present in

A
Incurrent canals
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B
Radial canals
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C
Excurrent canals
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D
Spongocoel
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Solution

The correct option is A Radial canals
A. Incurrent canals are the openings in the body of sponges through which water enters from outside.
B. Radial canals are the small radial or flagellated chambers in the body of sponges that are lined by choanocytes or collar cells.
C. Excurrent canals are the openings in the body of sponges through which water flows out..
D. Spongocoel is the central cavity in the body of sponges which opens to outside through osculum.
Hence, Choanocytes are present in radial canals. So, the correct answer is 'Radial canals'.

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