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Which of the following is not an inhibitory substance governing seed dormancy?

1. Abscisic acid
2. Phenolic acid
3. Para-ascorbic acid
4. Gibberellic acid

Correct answer: Gibberellic acid

Solution

Abscisic acid and several phenolic compounds are known to inhibit germination and help maintain seed dormancy. Gibberellic acid does the opposite: it breaks dormancy and promotes germination, so it is not an inhibitory substance.

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