Apical dominance is caused by

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Cytokinin

Gibberellins

Auxin

Ethylene

answer is A.

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Detailed Solution

Apical Dominance is thought to be caused by the apical bud producing IAA (auxin) in abundance. This auxin is transported basipetally from the apical bud. ... Since the auxin concentration is much lower, the lateral buds can now grow. In fact their growth will be stimulated by a relatively small drop in auxin concentration.

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