Assertion :TIBA ( $2, 3, 5$ -triiodobenzoic acid) functions as antiauxin. Reason: It blocks transport of auxin.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2,3,5- triiodobenzoic acid is a hormone mainly used for regulating and controlling plants growth.
It is an inhibitor of polar auxin transport. It acts as an antiauxin as it suppresses the embryogenic cells and embryo formation. It also suppresses the development of shoot and root apical meristems and also the vascular differentiation.
So, both Assertion and Reason are correct and Reason is the correct explanation for Assertion. (Option A)

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