How many growth inhibitors were reported by three independent researches during 1960 s

Options

A. 2
B. 3
C. 4
D. 5

Answer

To answer the question about how many growth inhibitors were reported by three independent researchers during the 1960s, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Context**: The question focuses on the research conducted in the 1960s regarding growth inhibitors in plants.

2. **Recall the Researchers' Findings**: According to the video transcript, three independent researchers purified and characterized three different growth inhibitors during this period.

3. **List the Growth Inhibitors**: The transcript mentions the names of the growth inhibitors as Inhibitor B, Abscission 2, and Dormin.

4. **Summarize the Findings**: These three growth inhibitors were found to be chemically similar and were collectively referred to as Abscisic Acid (ABA).

5. **Determine the Answer**: Since three growth inhibitors were reported, the correct answer to the question is 3.

### Final Answer:
**3 growth inhibitors were reported by three independent researchers during the 1960s.**

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