[A]: Maximum transpiration occurs in meso- phytes than xerophytes.
[R]: In mesophytes stomata are found on both surfaces of leaves and guard cells show frequent movements

Options

A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false

Answer

To analyze the statements provided in the question, we need to evaluate both the assertion (A) and the reason (R) regarding transpiration in mesophytes and xerophytes.

### Step-by-Step Solution:

1. **Understanding Transpiration**:
- Transpiration is the process by which water vapor is lost from the plant to the atmosphere, primarily through small openings called stomata.

2. **Comparing Mesophytes and Xerophytes**:
- **Mesophytes** are plants that thrive in moderate environments with sufficient moisture. They generally have a higher rate of transpiration because they are adapted to environments where water is readily available.
- **Xerophytes**, on the other hand, are adapted to survive in arid conditions. They have features that minimize water loss, leading to lower transpiration rates.

3. **Analyzing Statement A**:
- The assertion states that "Maximum transpiration occurs in mesophytes than xerophytes." This statement is true because mesophytes have a higher rate of transpiration compared to xerophytes due to their adaptation to moist environments.

4. **Analyzing Statement R**:
- The reason states that "In mesophytes, stomata are found on both surfaces of leaves and guard cells show frequent movements." This statement is also true. Mesophytes typically have stomata on both the upper and lower surfaces of their leaves, allowing for efficient gas exchange and transpiration.

5. **Evaluating the Relationship Between A and R**:
- While both statements A and R are true, the reason (R) does not directly explain the assertion (A). The presence of stomata on both surfaces and the frequent movement of guard cells in mesophytes contributes to their ability to transpire effectively, but it is not the sole reason for the higher transpiration rates compared to xerophytes.

6. **Conclusion**:
- Therefore, the correct evaluation is that both A and R are true, but R is not the correct explanation for A.

### Final Answer:
- **A**: True
- **R**: True
- **Explanation**: R is not the correct explanation for A.