Assertion :Sponges belongs to Porifera. Reason: Sponges have canal system.

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 belongs to phylum Porifera. They are multicellular organisms, that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells.
Canal system is the characteristic feature of Porifera. They need a continuous current of water flowing through their bodies for respiration, excretion, nutrition and reproduction but it is due to the presence of pores that the phylum is called as phylum Porifera.
Therefore, the correct answer is option B.

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