In dorsiventral leaf, the number of stomata per unit area are

Options

A. More on upper surface
B. More on lower surfece (epidermis)
C. More on upper surface(epodermis )
D. Absent on upper surface (epidermis)

Answer

### Step-by-Step Solution:

1. **Understanding Dorsiventral Leaves**:
- Dorsiventral leaves, also known as bifacial leaves, have two distinct surfaces: the upper (adaxial) surface and the lower (abaxial) surface.

2. **Stomatal Distribution**:
- In dorsiventral leaves, the stomata are primarily located on the lower surface (abaxial surface) of the leaf. This adaptation helps reduce water loss through transpiration, as the lower surface is less exposed to direct sunlight and wind.

3. **Comparing Stomatal Density**:
- When comparing the number of stomata per unit area, it is observed that there are significantly more stomata on the lower surface compared to the upper surface.

4. **Conclusion**:
- Based on the distribution pattern of stomata in dorsiventral leaves, the correct answer to the question is that the number of stomata per unit area is more on the lower surface epidermis.

### Final Answer:
- The number of stomata per unit area in a dorsiventral leaf is **more on the lower surface epidermis** (Option B).

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