[A]: Auxins are found in large amounts in the apical Meristem of shoot.
[R]: Because the shoot is exposed to the sunlight.

Options

A. (a) If both A and R are true and R is the correct explanation of A
B. (b) If both A and R are true but R is not the correct explanation of A
C. (c) if A is true and R is false
D. (d) If both A and R are false

Answer

To analyze the given assertion and reason, let's break it down step by step:

### Step 1: Understand the Assertion
- **Assertion (A)**: "Auxins are found in large amounts in the apical meristem of the shoot."
- **Explanation**: Auxins are a type of plant hormone that play a crucial role in the growth and development of plants. They are primarily concentrated in the apical meristem, which is the growing tip of the shoot. This concentration is essential for promoting growth and elongation of the plant.

### Step 2: Understand the Reason
- **Reason (R)**: "Because the shoot is exposed to the sunlight."
- **Explanation**: While it is true that the shoot is exposed to sunlight, which is necessary for photosynthesis, this exposure does not directly explain why auxins are concentrated in the apical meristem. The presence of auxins is more related to the growth processes rather than the sunlight exposure itself.

### Step 3: Analyze the Relationship Between Assertion and Reason
- Both the assertion and the reason are true statements:
- Auxins are indeed found in large amounts in the apical meristem.
- The shoot is exposed to sunlight.
- However, the reason provided does not correctly explain the assertion. The concentration of auxins in the apical meristem is not due to the shoot's exposure to sunlight; rather, it is a result of the plant's growth processes.

### Step 4: Conclusion
- Since both the assertion and reason are true but the reason does not explain the assertion, the correct answer is:
- **Option B**: Both assertion and reason are true, but the reason is not the correct explanation of the assertion.

### Final Answer
- **Answer**: B - Both assertion and reason are true, but reason is not the correct explanation of assertion.

---