In dicotyledonous leaf

Options

A. A thick cuticle is usually present on the outer epidermal walls of cells.
B. The lower epidermis bears large number of stomata and is also covered by a thick layer of cuticle
C. In some dicots a few large, empty and colourless cells are also present at intervals on the upper surface. These are called the bulliform cells.
D. Mesophyll is not differentiated into palisade and spongy parenchyma.

Explanation

**Step-by-Step Solution:**

1. **Identify the Structure of Dicotyledonous Leaf:**
- A dicotyledonous leaf typically has a structure that includes an outer epidermis, mesophyll, and vascular bundles.

2. **Examine the Epidermis:**
- The outer epidermal wall of dicotyledonous leaves usually has a thick cuticle. This cuticle helps in reducing water loss and protects the leaf from environmental factors.

3. **Analyze the Lower Epidermis:**
- The lower epidermis contains a large number of stomata. Stomata are small openings that facilitate gas exchange (carbon dioxide and oxygen) and transpiration (loss of water vapor).

4. **Understand the Role of Stomata:**
- Stomata play a crucial role in transpiration, which is the process of water vapor loss from the leaf surface. This process is essential for maintaining water and nutrient flow within the plant.

5. **Identify the Presence of Bulliform Cells:**
- In some dicotyledonous leaves, there are large, colorless cells known as bulliform cells. These cells help in the folding and unfolding of leaves in response to water availability.

6. **Differentiate Mesophyll:**
- The mesophyll in dicotyledonous leaves is differentiated into two types: palisade parenchyma (which is tightly packed and located on the upper side) and spongy parenchyma (which is loosely arranged and located on the lower side).

7. **Conclusion:**
- The correct statement regarding dicotyledonous leaves is that they typically have a thick cuticle on the outer epidermal wall, while the lower epidermis has numerous stomata for gas exchange and transpiration.

**Final Answer:**
The correct statement about dicotyledonous leaves is that they usually have a thick cuticle on the outer epidermal wall of cells.

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