Select an incorrect statement regarding factors affecting transpiration

Options

A. Transpiration is affected by humidity, temperature and wind speed.
B. Rate of evaporation doubles with every rise in temperature by `10^(@)`C
C. A very high temperature reduces transpiration.
D. A high wind speed or a dry breeze will greatly decrease transpiration.

Answer

To solve the question regarding the incorrect statement about factors affecting transpiration, we need to analyze each of the provided options carefully.

### Step-by-Step Solution:

1. **Understanding Transpiration**:
- Transpiration is the process of water vapor loss from the aerial parts of plants, primarily through stomata, cuticles, and lenticels. It is influenced by various environmental factors.

2. **Analyzing the Options**:
- **Option 1**: "Transpiration is affected by humidity, temperature, and wind speed."
- This statement is correct. Humidity decreases transpiration, while higher temperatures and increased wind speed enhance it.

- **Option 2**: "Rate of evaporation doubles with every rise in temperature by 10 degrees Celsius."
- This statement is also correct. It is a known fact that the rate of evaporation increases significantly with temperature.

- **Option 3**: "A very high temperature reduces transpiration."
- This statement is partially correct. While transpiration generally increases with temperature, extremely high temperatures can cause stomata to close due to loss of turgidity in guard cells, thus reducing transpiration.

- **Option 4**: "A high wind speed or a dry breeze will greatly decrease transpiration."
- This statement is incorrect. High wind speed or a dry breeze actually increases transpiration by removing water vapor from around the stomata, promoting further evaporation.

3. **Conclusion**:
- The incorrect statement regarding factors affecting transpiration is **Option 4**: "A high wind speed or a dry breeze will greatly decrease transpiration."

### Final Answer:
The incorrect statement is: **A high wind speed or a dry breeze will greatly decrease transpiration.**

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