Assertion :Sponges have body organization of cellular level. Reason: There is some physiological division of labour.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Sponges are multicellular but they have cellular level of body organization meaning that their cells are specialized, so that different cells perform different functions but similar cells are not organized into tissues and bodies are a loose aggregation of different kinds of cells.
There is some physiological division of labour, accompanied with structural differentiation amongst body cells. But here, similar cells are arranged neither in permanent layer nor masses to form tissues.
Hence the correct option is B.

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