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

### Step-by-Step Text Solution:

1. **Understanding Transpiration**:
- Transpiration is defined as the loss of water in the form of vapor from the aerial parts of the plant. This process is crucial for maintaining plant health and facilitating nutrient transport.

2. **Identifying Factors Affecting Transpiration**:
- Several factors influence the rate of transpiration, including:
- **Light**: Increases transpiration as it warms the leaves and opens stomata.
- **Relative Humidity**: Higher humidity decreases transpiration because the concentration gradient for water vapor is reduced.
- **Temperature**: Generally, higher temperatures increase the rate of transpiration, but extremely high temperatures can lead to a decrease in transpiration due to stomatal closure.
- **Wind Speed**: Increased wind speed enhances transpiration by removing the water vapor that accumulates around the leaf surface.
- **Soil Water Availability**: Adequate soil moisture is necessary for transpiration; if soil water is limited, transpiration rates will drop.

3. **Analyzing the Given Statements**:
- **Statement 1**: "Transpiration is affected by humidity." (Correct)
- **Statement 2**: "The rate of evaporation doubles with every rise in temperature by 10 degrees." (Correct)
- **Statement 3**: "A very high temperature reduces transpiration." (Incorrect)
- **Statement 4**: "High wind speed and dry breeze will greatly decrease transpiration." (Incorrect)

4. **Identifying the Incorrect Statement**:
- Among the statements analyzed, Statement 3 is incorrect because while higher temperatures generally increase transpiration, extremely high temperatures can lead to stomatal closure, which would reduce transpiration.
- Statement 4 is also incorrect because high wind speeds actually increase transpiration by removing water vapor from around the leaves.

5. **Conclusion**:
- The incorrect statement regarding factors affecting transpiration is **Statement 3**: "A very high temperature reduces transpiration."