Which of the following is not a function of transpiration ?

Options

A. Cooling of leaves
B. Uptake of minerals
C. Excretion of minerals
D. Uptake of water

Answer

**Step-by-Step Solution:**

1. **Understanding Transpiration**: Transpiration is the process by which water vapor is lost from the aerial parts of plants, primarily through small openings called stomata. This process is crucial for several physiological functions in plants.

2. **Identifying Functions of Transpiration**:
- **Cooling of Leaves**: When water evaporates from the leaf surface, it cools the plant, helping to regulate temperature.
- **Uptake of Minerals**: Transpiration creates a negative pressure in the xylem, which helps in the upward movement of water and dissolved minerals from the roots to the leaves.
- **Uptake of Water**: Transpiration aids in the absorption of water from the soil through the roots, as the loss of water from the leaves creates a suction effect.
- **Excretion of Minerals**: This is not a function of transpiration. While plants do excrete some waste products, this process does not occur through transpiration.

3. **Analyzing the Options**:
- **Cooling of Leaves**: This is a function of transpiration.
- **Uptake of Minerals**: This is a function of transpiration.
- **Uptake of Water**: This is a function of transpiration.
- **Excretion of Minerals**: This is NOT a function of transpiration.

4. **Conclusion**: The option that is not a function of transpiration is **excretion of minerals**.

**Final Answer**: Excretion of minerals is not a function of transpiration.

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