Transpiration rater of a dorsiventral lead is

Options

A. Higher on the lower surface
B. Higher on the upper surface
C. Equal on both the surfaces
D. Dependent upon species

Answer

**Step-by-Step Solution:**

1. **Understanding Transpiration**:
- Transpiration is the process through which plants lose water in the form of vapor. This occurs mainly through small openings called stomata.

2. **Identifying the Leaf Type**:
- The question specifically mentions a "dorsiventral leaf." This type of leaf has two distinct surfaces: the upper (adaxial) surface and the lower (abaxial) surface.

3. **Stomata Distribution**:
- In dorsiventral leaves, the distribution of stomata is not uniform. Typically, there are more stomata on the lower surface of the leaf compared to the upper surface. This is an adaptation to minimize water loss and protect against direct sunlight.

4. **Comparing Transpiration Rates**:
- Since the lower surface has more stomata, it follows that the rate of transpiration will be higher on this surface. The upper surface, having fewer stomata, will have a lower rate of transpiration.

5. **Conclusion**:
- Therefore, the transpiration rate of a dorsiventral leaf is higher on the lower surface compared to the upper surface.

**Final Answer**: The transpiration rate of a dorsiventral leaf is higher on the lower surface.

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