The discovery of PGRs started with the observation of the following scientists

Options

A. Charles Darwin and Francis Darwin.
B. Charles Darwin and Nicolus Darwin.
C. F.W.Went and Miller
D. F.Skoog and Miller

Answer

To answer the question regarding the discovery of plant growth regulators (PGRs) and the scientists involved, we can follow these steps:

### Step 1: Understand the Question
The question asks about the scientists who initiated the discovery of plant growth regulators (PGRs).

### Step 2: Analyze the Options
We have four pairs of scientists to consider:
- A. Charles Darwin and Francis Darwin
- B. Charles Darwin and Nicholas Darwin
- C. F. W. Wendt and Miller
- D. F. Skoog and Miller

### Step 3: Historical Context
Research the contributions of each pair of scientists to plant growth regulation:
- **Charles Darwin and Francis Darwin**: They conducted experiments on the coleoptiles of canary grass and observed that the bending of the plant was due to a substance that influenced growth, which we now know as auxin.
- **F. W. Wendt and Miller**: They were involved in the discovery of auxin but did not start the research on PGRs.
- **F. Skoog and Miller**: They discovered kinetin, a type of PGR, but again, they did not initiate the discovery of PGRs.
- **Charles Darwin and Nicholas Darwin**: There is no significant contribution from Nicholas Darwin in the context of PGRs.

### Step 4: Identify the Correct Pair
From the analysis, it is clear that the correct answer is **A. Charles Darwin and Francis Darwin**, as they were the first to observe the effects of a plant growth hormone (auxin) on plant growth.

### Step 5: Conclusion
The discovery of plant growth regulators started with the observations made by **Charles Darwin and Francis Darwin**.

---