Foolish Seedling disease of rice led to the discovery of

Options

A. 2, 4-D
B. IAA
C. GA
D. ABA

Answer

**Step-by-Step Text Solution:**

1. **Understanding Foolish Seedling Disease**: Foolish Seedling Disease is a condition that affects rice plants, leading to abnormal growth and elongation of seedlings. This disease is caused by a specific fungus.

2. **Identifying the Causal Organism**: The causal organism of the Foolish Seedling Disease is a fungus known as *Gibberella fujikuroi*. This fungus was first identified in Japan.

3. **Discovery of Gibberellins**: In 1926, a scientist named Kurosawa discovered that the fungus *Gibberella fujikuroi* produces a substance that causes the abnormal growth in rice seedlings. This substance was later named "gibberellin."

4. **Significance of Gibberellins**: Gibberellins (GA) are a group of plant hormones that play crucial roles in regulating growth and development in plants. They are involved in processes such as seed germination, stem elongation, and flowering.

5. **Conclusion**: Therefore, the Foolish Seedling Disease of rice led to the discovery of Gibberellins (GA), which are important plant growth regulators.

**Final Answer**: Foolish Seedling Disease of rice led to the discovery of Gibberellins (GA).

---