alleryThe internodal elongation seen in rice plants suffering from Bakanae or foolish seedling disease is caused by a substance later identified as:
AAbscisic acid
BEthylene gas
CGibberellic acid
DIndole acetic acid
Answer & Solution
Correct answer: C. Gibberellic acid
1. Kurosawa observed Bakanae (foolish seedling) disease causing excess internodal elongation in rice.
2. The disease was caused by the fungus Gibberella fujikuroi.
3. The active substance from the fungus was identified as gibberellic acid.
4. Abscisic acid and ethylene are inhibitors, and auxin (IAA) is a different growth promoter, so they are ruled out.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 16 Plant and Animal Hormones "Gibberellins", p.238_
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