In grasses, the type of cells which help in transpiration and rolling of leaves repectively are

Options

A. dumb-bell shaped cells and empty colourless cells.
B. lenticels and mesophyll cells
C. normal epidermal cell and guard cells
D. bulliform cells and bean- shaped cells.

Answer

To answer the question regarding the types of cells in grasses that help in transpiration and rolling of leaves, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Identify the Cells Involved in Transpiration:**
- In grasses, the cells responsible for transpiration are known as **guard cells**.
- These cells are located in the epidermis of the leaves and are typically shaped like dumbbells.

2. **Understand the Function of Guard Cells:**
- Guard cells regulate the opening and closing of stomata, which are small openings on the leaf surface.
- When the guard cells swell with water, they open the stomata, allowing for gas exchange and transpiration to occur.

3. **Identify the Cells Involved in Leaf Rolling:**
- The cells that assist in the rolling of leaves in grasses are called **buliform cells** (also known as motor cells).
- These cells are large, colorless, and hygroscopic (water-attracting) and are found in the upper epidermis of the grass leaves.

4. **Understand the Function of Buliform Cells:**
- Buliform cells are responsible for the rolling and unrolling of the leaf lamina.
- They cause the leaves to roll up during dry conditions to reduce water loss and unroll when conditions are moist.

5. **Conclude the Answer:**
- Therefore, the types of cells that help in transpiration and rolling of leaves in grasses are:
- **Guard cells** for transpiration.
- **Buliform cells** for rolling of leaves.

### Final Answer:
In grasses, the type of cells which help in transpiration and rolling of leaves respectively are **guard cells** and **buliform cells**.

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