Which one of the following will not directly effect transpiration?

Options

A. Temperature
B. Light
C. Wind speed
D. Respiration

Answer

**Step-by-Step Solution:**

1. **Understanding Transpiration:**
- Transpiration is the process by which water vapor is lost from the aerial parts of plants, primarily through small openings called stomata found on the leaves.

2. **Identifying Factors Affecting Transpiration:**
- The question asks which factor does not directly affect transpiration. The options provided are:
- Temperature
- Light
- Wind Speed
- Respiration

3. **Analyzing Each Option:**
- **Temperature:**
- Higher temperatures increase the rate of transpiration because warmer air can hold more moisture.
- **Light:**
- Light influences transpiration rates, with maximum transpiration occurring under blue light compared to red light.
- **Wind Speed:**
- Increased wind speed enhances transpiration by removing water vapor from around the stomata, thus maintaining a gradient for water loss.
- **Respiration:**
- Respiration is a metabolic process that occurs in plants but does not directly influence the rate of transpiration.

4. **Conclusion:**
- Among the options, respiration is the only factor that does not directly affect transpiration. Therefore, the correct answer is option four: **Respiration.**

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