In which of the following condition transpiration will be minimum ?

Options

A. Good soil moisture
B. High wind velocity
C. Dry environment
D. High atmospheric humidity

Answer

To determine the condition in which transpiration will be minimum, we need to analyze the factors that influence the rate of transpiration in plants.

### Step-by-Step Solution:

1. **Understanding Transpiration**:
- Transpiration is the process by which water vapor is lost from the plant's surface, primarily through small openings called stomata.

2. **Factors Affecting Transpiration**:
- Several environmental factors can affect the rate of transpiration, including soil moisture, wind velocity, humidity, and environmental dryness.

3. **Evaluating the Options**:
- **Good Soil Moisture**: While good soil moisture supports plant health, it does not directly reduce transpiration. Therefore, this condition does not minimize transpiration.
- **High Wind Velocity**: High wind can increase transpiration rates by removing the moisture-laden air around the stomata, leading to a higher rate of water loss. Thus, this condition does not minimize transpiration.
- **Dry Environment**: In a dry environment, the transpiration rate is generally high because the gradient for water vapor loss is steep. Therefore, this condition also does not minimize transpiration.
- **High Atmospheric Humidity**: When the humidity in the atmosphere is high, the concentration gradient for water vapor between the inside of the leaf and the outside air decreases. This results in reduced water loss from the plant, leading to minimum transpiration.

4. **Conclusion**:
- The condition in which transpiration will be minimum is **high atmospheric humidity**.

### Final Answer:
**High atmospheric humidity** is the condition in which transpiration will be minimum.