Assertion :Suppression of growth of axillary buds is called apical dominance. Reason: It is due to effect of downward movement of Auxin from apical region towards the lower side.

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.
Auxin is the phytohormone which prevents apical dominance.
Apical dominance is the growth of apex of plant, so that the main stem grows taller and taller.
When grasses or bushes are pruned, auxin moves to sides or lateral buds, so that the plant starts growing sidewards.

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