Question

A common chamber for all the canals of a sponge is$/$cavity present in all sponges is

• A. Incurrent canal
• B. Paragastric cavity
• C. Excurrent canal
• D. Radial chamber

Answer 1

The correct option is B Paragastric cavity

A. Incurrent canals are the opening through which water enters the body of sponges and reach the radial canals.

B. Paragastric cavity or spongocoel is the central body cavity of sponges and is present in all sponges regardless of type of canal system in them.

C. Excurrent canals are the openings through which water flows out of the body of sponges.

D. Radial chambers are the small radial or flagellated chambers in the body of sponges that are lined by choanocytes or collar cells.

Hence, cavity present in all sponges is paragastic cavity.

So, the correct answer is 'Paragastric cavity'.