A dorsiventral leaf is identified by the presence of

Options

A. stomata on both the epidermis
B. stomata on the upper epidermis only
C. stomata on the lower epidermis only
D. no stomata on the epidermis

Answer

### Step-by-Step Solution:

1. **Understanding Leaf Types**:
- Leaves can be classified based on their anatomical structure. The two main types are dorsiventral and isobilateral leaves. Dorsiventral leaves are typically found in dicots, while isobilateral leaves are found in monocots.

2. **Identifying Dorsiventral Leaves**:
- Dorsiventral leaves are characterized by having a distinct upper and lower surface. The upper surface is usually more exposed to sunlight, while the lower surface is more shaded.

3. **Stomata Distribution**:
- A key feature that helps identify dorsiventral leaves is the distribution of stomata (small pores used for gas exchange). In dorsiventral leaves, stomata are predominantly located on the lower epidermis of the leaf.

4. **Comparison with Isobilateral Leaves**:
- In contrast, isobilateral leaves have a uniform distribution of stomata on both the upper and lower surfaces. This is typical in monocots, where the stomata are evenly distributed to maximize gas exchange on both sides.

5. **Conclusion**:
- Therefore, a dorsiventral leaf is identified by the presence of more stomata on the lower epidermis compared to the upper epidermis.