Biology
Assertion (A): Ostia are the openings in the body wall of sponges through which water enters inside the body.
Reason (R): Osculum is a mouth-like structure on the top of the sponge's body through which water is thrown out.
- A is True and R is False.
- A is False and R is True.
- Both A and R are True.
- Both A and R are False.
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Answer
Both A and R are True.
Reason — Ostia are tiny pores present all over the body of a sponge. They allow water to enter the body, bringing in oxygen and food particles. The osculum is a large opening at the top of the sponge. It is the exit point for water after circulation through the sponge’s body.
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