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“Foolish seedling” disease of rice led to the discovery of

1. ABA
2. 2, 4-D
3. IAA
4. GA

Correct answer: GA

Solution

Foolish seedling disease of rice was traced to a gibberellin-producing fungus, which led to the discovery of gibberellic acid (GA). GA is known for promoting stem elongation, matching the disease symptoms.

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