The factors that affect transpiration is/are

Options

A. Temprature
B. Light
C. Humidity
D. All of these

Answer

### Step-by-Step Text Solution:

1. **Understanding Transpiration**:
- Transpiration is defined as the process of water vapor loss from plant surfaces, primarily through small openings called stomata. This process is crucial for maintaining plant health and regulating temperature.

2. **Identifying Factors Affecting Transpiration**:
- There are several factors that can influence the rate of transpiration in plants. These can be categorized into external (environmental) and internal (plant-specific) factors.

3. **External Factors**:
- **Temperature**: Higher temperatures increase the rate of transpiration because warm air can hold more water vapor, leading to a greater evaporation rate.
- **Light**: Light affects the opening of stomata. During the day, when light is abundant, stomata tend to open, facilitating transpiration.
- **Humidity**: Lower humidity levels increase transpiration rates. When the air is dry, water vapor diffuses more readily from the plant to the atmosphere.
- **Wind Speed**: Increased wind can enhance transpiration by removing the boundary layer of humid air around the leaf surface, allowing for more rapid water vapor loss.

4. **Internal Factors**:
- **Stomatal Distribution**: The number and distribution of stomata on a leaf surface can affect transpiration rates. More stomata can lead to increased transpiration.
- **Percentage of Open Stomata**: The degree to which stomata are open at any given time will influence the rate of transpiration.
- **Water Status of the Plant**: The availability of water within the plant affects its ability to transpire. If a plant is well-watered, it can transpire more effectively.

5. **Conclusion**:
- In summary, the main factors affecting transpiration include temperature, light, humidity, wind speed, stomatal distribution, the percentage of open stomata, and the water status of the plant. Therefore, the correct answer to the question is "all of these."