Assertion :Phellogen is cork cambium formed in dicot roots and shoots to protect underlying tissues. Reason: It secretes phellem which substitutes epidermis after secondary growth.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Cork cambium or phellogen is a lateral meristem which is involved in increasing the diameter of the stem. The phellogen differentiates phellem on its outer face which substitutes epidermis after secondary growth.
Therefore, the correct answer is option A.

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