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Which one of the following generally acts as an antagonist to gibberellins?

1. Zeatin
2. Ethylene
3. ABA
4. IAA

Correct answer: ABA

Solution

Abscisic acid (ABA) generally counteracts gibberellin actions by promoting dormancy and inhibiting germination and growth. Because gibberellins usually stimulate these processes, ABA is considered their antagonist.

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