Transpiration is high under

Options

A. Rainy season/high humidity
B. Winter
C. High temperature
D. Low wind velocity

Answer

**Step-by-Step Solution:**

1. **Understanding Transpiration**: Transpiration is the process by which plants lose water in the form of vapor from their aerial parts, primarily through small openings called stomata.

2. **Factors Affecting Transpiration**: Several environmental factors influence the rate of transpiration, including temperature, humidity, wind velocity, and light intensity.

3. **Analyzing the Options**:
- **Rainy Season**: During the rainy season, the humidity is generally high, which reduces the rate of transpiration because the air is already saturated with moisture.
- **High Humidity**: Similar to the rainy season, high humidity means that the air has a lot of moisture, which slows down the rate of transpiration.
- **Winter**: In winter, temperatures are usually low, which also reduces the rate of transpiration.
- **High Temperature**: Higher temperatures increase the rate of evaporation of water from plant surfaces, leading to increased transpiration.
- **Low Wind Velocity**: Low wind velocity can lead to a buildup of moisture around the plant, which can decrease transpiration. Conversely, high wind velocity can remove moisture quickly, promoting transpiration.

4. **Conclusion**: Among the options provided, the condition that leads to high transpiration is **high temperature**. This is because higher temperatures increase the rate of water evaporation from the plant's surface.

**Final Answer**: Transpiration is high under **high temperature**.

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