Due to increasing temperature, transpiration

Options

A. Increases
B. Decreases
C. First increases then decreases
D. Unaffected

Answer

**Step-by-Step Solution:**

1. **Understanding Transpiration**: Transpiration is the process through which plants lose water vapor from their leaves. This process occurs primarily through small openings called stomata.

2. **Effect of Temperature on Transpiration**: When the temperature increases, the rate of transpiration typically increases as well. This is because higher temperatures can cause water to evaporate more quickly from the leaf surfaces.

3. **Initial Increase in Transpiration**: As the temperature rises, the kinetic energy of water molecules increases, leading to a higher rate of evaporation. Therefore, initially, transpiration rates will increase.

4. **Subsequent Decrease in Transpiration**: However, if the temperature continues to rise excessively, it can lead to a decrease in transpiration. This happens because the plant may close its stomata to prevent excessive water loss, thus reducing the rate of transpiration.

5. **Conclusion**: Therefore, the overall effect of increasing temperature on transpiration can be summarized as: it first increases and then decreases. This leads us to the correct answer, which is that transpiration first increases and then decreases.

6. **Final Answer**: The correct option is: "first increases then decreases."

---