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Apical dominance is caused by

1. abscisic acid in lateral bud
2. cytokinin in leaf tip
3. gibberellin in lateral buds
4. auxin in shoot tip

Correct answer: auxin in shoot tip

Solution

Apical dominance is controlled by auxin made in the shoot tip. This auxin moves downward and suppresses the growth of lateral buds, so the main shoot keeps growing preferentially.

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