Question

‘Foolish seedling disease’ of rice led to the discovery of ______.

Options

• IAA

• GA

• IBA

• 2,4-D

Answer 1

'Foolish seedling disease' of rice led to the discovery of GA.

Explanation:

The foolish seedling disease (also known as bakanae disease) in rice crops caused infected seedlings to grow abnormally tall, thin, and sterile. Japanese scientists discovered that this extreme overgrowth was triggered by a chemical substance secreted by the infecting parasitic fungus, Gibberella fujikuroi. This active compound was subsequently isolated from the fungal filtrate and named gibberellin (GA), marking the discovery of this crucial class of plant growth-promoting hormones.