Apical dominance in higher plants is down regulated by

Cytokinins

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Enzyme activity and metabolism

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Auxins

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Photoperiodism

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Solution

The correct option is A Cytokinins
Auxin is responsible for apical dominance in plants and the cytokinins antagonize auxin's apical dominance by promoting the growth of lateral buds. Therefore, cytokinins downregulate the apical growth or apical dominance in higher plants.

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