Identify the correct statements among the following.
I. Kurosawa found symptoms of "Bakanae" disease on rice seedlings when they were treated with sterile filtrates of Gibberella fujikuroi.
II. The discovery of each of the five major groups of PGR has been accidental.
III. Cousins confirmed the release of a volatile substance from ripened oranges that hastened the ripening of stored unripened bananas.
IV. F.W Went isolated auxins form coleoptile tips of Avena grass

Options

A. II only
B. I, II, III only
C. I, II , III , IV
D. III, IV, only

Answer

To solve the question of identifying the correct statements among the given options, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Statement I: Kurosawa found symptoms of "Bakanae" disease on rice seedlings when they were treated with sterile filtrates of Gibberella fujikuroi.**
- This statement is **correct**. The "Bakanae" disease, also known as "foolish seedling disease," is indeed caused by the fungus Gibberella fujikuroi, and Kurosawa was the one who discovered this relationship.

2. **Statement II: The discovery of each of the five major groups of PGR has been accidental.**
- This statement is also **correct**. The five major groups of plant growth regulators (PGRs) — auxins, gibberellins, cytokinins, abscisic acid, and ethylene — were discovered through various accidental observations and experiments.

3. **Statement III: Cousins confirmed the release of a volatile substance from ripened oranges that hastened the ripening of stored unripened bananas.**
- This statement is **correct**. Cousins indeed confirmed that the volatile substance released from ripened oranges is ethylene, which promotes the ripening of other fruits, including bananas.

4. **Statement IV: F.W. Went isolated auxins from coleoptile tips of Avena grass.**
- This statement is **correct**. F.W. Went conducted experiments where he isolated auxins from the coleoptile tips of Avena (oat) grass, which led to significant findings about plant growth and tropisms.

### Conclusion:
All four statements (I, II, III, and IV) are correct. Therefore, the correct option is:

- **Option III: First, second, third, fourth.**