Stomata are distributed more on the lower surface than on the upper surface in

Options

A. equifacial leaf
B. bifacial leaf
C. unifacial leaf
D. both a and b

Answer

**Step-by-Step Solution:**

1. **Understanding Stomata**: Stomata are small openings found primarily on the surfaces of leaves. They facilitate the exchange of gases (like oxygen and carbon dioxide) and the release of water vapor through a process called transpiration.

2. **Types of Leaf Structures**: There are three main types of leaf structures based on the distribution of stomata:
- **Equifacial Leaves**: These leaves do not show a distinction between the upper and lower surfaces. Stomata are present on both surfaces equally. An example of this type is the leaves of monocots (like grasses).

- **Bifacial Leaves**: These leaves have a clear distinction between the upper and lower surfaces. In bifacial leaves, stomata are predominantly found on the lower surface. An example of this type is the leaves of dicots (like broadleaf plants).

- **Unifacial Leaves**: These leaves also do not show a distinction between upper and lower surfaces, but they are typically cylindrical in shape. Stomata can be present on one side or both sides, depending on the specific plant.

3. **Conclusion**: Given that the question states that stomata are distributed more on the lower surface than on the upper surface, the correct answer is that this characteristic is found in **bifacial leaves**.

**Final Answer**: Stomata are distributed more on the lower surface than on the upper surface in bifacial leaves.

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