Motor cells take part in
(a) guttation
(b) transpiration
(c) inrolling
(d) all the above

Options

A. guttation
B. transpiration
C. inrolling
D. all the above.

Answer

To solve the question, "Motor cells take part in," we need to analyze the options provided and understand the role of motor cells, also known as bulliform cells.

### Step-by-Step Solution:

1. **Identify Motor Cells**:
- Motor cells are also known as bulliform cells.
- They are large epidermal cells found primarily in the leaves of monocots.

2. **Function of Bulliform Cells**:
- Bulliform cells are hygroscopic, meaning they can absorb and lose water.
- They play a crucial role in the leaf's ability to roll and unroll.

3. **Guttation**:
- Guttation is the process of water exudation from the leaves, usually occurring at night.
- Bulliform cells are not directly involved in this process.

4. **Transpiration**:
- Transpiration is the process of water vapor loss from the plant, primarily through stomata.
- While bulliform cells may influence leaf structure, they do not directly participate in transpiration.

5. **Inrolling**:
- Inrolling refers to the rolling of leaves, which occurs under dry conditions to reduce water loss.
- Bulliform cells are directly involved in this process, as they help the leaf to roll up when water is scarce.

6. **Conclusion**:
- Since bulliform cells are primarily involved in the inrolling of leaves, the correct answer is option (c) inrolling.
- Therefore, the answer to the question is **(c) inrolling**.