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Question

The correct flow of water current in sponges is

A
ostia → osculum → spongocoel → outside
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B
osculum → spongocoel → ostia → outside
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C
ostia → spongocoel → osculum → outside
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D
osculum → ostia → spongocoel → outside
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Solution

The correct option is C ostia → spongocoel → osculum → outside

Water canal system is unique to sponges. It is a system of pores through which water enters and leaves the body of a sponge.

It helps in food gathering, respiration, excretion and reproduction.

Water enters through ostia (inlet pore) into spongocoel and then passes through canals and finally leaves the body through osculum (outlet pore).

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