Apical dominance is regulated by the hormone

Auxin

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Gibberellin

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Ethylene

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Abscisic acid

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Solution

The correct option is A Auxin
The mechanism of apical dominance is based on the plant hormone auxin. It is produced in the apical meristem and transported towards the roots in the cambium. If apical dominance is complete, it prevents any branches from forming as long as the apical meristem is active. If the dominance is incomplete, side branches will develop.

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