In grasses, bulliform cells are

Options

A. Large bubble - shaped epidermal cells, present on the lower surface of leaves
B. large bubble-shaped epidermal cells, present on the upper surface of leaves
C. small pyramidal epidermal cells, present on the upper surface of leaves
D. small pyramidal epidermal cells , present on the lower surface of leaves

Answer

To solve the question regarding bulliform cells in grasses, we will analyze the provided statements and determine which one is correct based on our understanding of bulliform cells.

### Step-by-Step Solution:

1. **Understanding Bulliform Cells**:
- Bulliform cells, also known as motor cells, are specialized epidermal cells found in the leaves of many monocots, particularly grasses. They are characterized by their large, bubble-like shape.

2. **Location of Bulliform Cells**:
- These cells are predominantly located on the upper surface of the leaves. This is important to note, as their position plays a significant role in their function.

3. **Function of Bulliform Cells**:
- The primary function of bulliform cells is to help the plant manage water loss through transpiration. They can change shape in response to water availability, helping the leaf to roll or fold, thereby reducing the surface area exposed to the sun and minimizing water loss.

4. **Analyzing the Statements**:
- Now we will evaluate the statements provided in the question:
- **Statement 1**: "Large bubble-shaped epidermal cells" - This is correct, but if it mentions the lower surface, it is wrong.
- **Statement 2**: "Present on the upper surface of leaves" - This is correct.
- **Statement 3**: "Small cells, pyramidal epidermal cells" - This is incorrect as bulliform cells are large and not pyramidal.
- **Statement 4**: Any statement mentioning incorrect location or shape would also be wrong.

5. **Conclusion**:
- The correct statement regarding bulliform cells is that they are large bubble-shaped epidermal cells present on the upper surface of the leaves.

### Final Answer:
The correct statement about bulliform cells is that they are large bubble-shaped epidermal cells present on the upper surface of the leaves.