The rate of transpiration increases with the decrease of

Options

A. temperature
B. wind velocity
C. light
D. atmospheric pressure

Answer

To solve the question "The rate of transpiration increases with the decrease of," we will analyze the factors affecting transpiration and determine which one, when decreased, leads to an increase in the rate of transpiration.

### 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**:
- The rate of transpiration is influenced by several environmental factors, including temperature, humidity, wind velocity, light intensity, and atmospheric pressure.

3. **Analyzing Each Option**:
- **Option 1: Temperature**:
- An increase in temperature leads to a decrease in relative humidity, which increases the rate of transpiration. Therefore, a decrease in temperature would not increase transpiration.
- **Option 2: Wind Velocity**:
- Increased wind velocity removes saturated air around the leaves, promoting transpiration. A decrease in wind velocity would lead to less transpiration, not more.
- **Option 3: Light**:
- Light promotes the opening of stomata during the day, leading to increased transpiration. A decrease in light would reduce transpiration.
- **Option 4: Atmospheric Pressure**:
- A decrease in atmospheric pressure allows for a greater capacity of the air to hold water vapor, thus increasing the rate of transpiration.

4. **Conclusion**:
- The correct answer is **Option 4: Atmospheric Pressure**. The rate of transpiration increases with a decrease in atmospheric pressure.