AIIMS 2019 Biology Vernalization Assertion Reason Question

Option B is correct because the assertion that vernalization induces flowering through low temperatures is true; many plants require a period of cold exposure to trigger flowering. However, the reason provided—that abscisic acid (ABA) is a growth-inhibiting hormone—while true, does not explain the mechanism of vernalization, which primarily involves the promotion of flowering rather than inhibition. Option A is incorrect because the reason does not correctly explain the assertion. Option C is incorrect as the assertion is true, but the reason is also true, making it not false. Option D is incorrect because both the assertion and reason are true statements.