Assertion :In Scypha, stomoblastula undergoes inversion and is now known as amphiblastula. Reason: Its one half bears flagella and the other half does not.

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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Assertion is incorrect but Reason is correct.

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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.
The assertion is correct as in Scypha, stomoblastula (blastula with mouth) undergoes inversion and is now known as amphiblastula. Amphiblastula undergoes gastrulation by invagination.
The reason is also correct but not correct explanation of assertion as amphiblastula is a free-swimming larva, a blastula with small flagellated cells in one hemisphere and large flagellated cells in the other.
Therefore, the correct answer is option B.

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