Which is not the function of transpiration?

Options

A. Cool leaf surface
B. Maintain shape and structure of plant
C. Help in translocation of sugars from source to sink
D. Provide water for photosynthesis

Answer

**Step-by-Step Solution:**

1. **Understanding Transpiration**: Transpiration is the process through which plants lose water vapor from their leaves. This process is crucial for various physiological functions in plants.

2. **Analyzing the Functions of Transpiration**:
- **Cool Leaf Surface**: Transpiration helps in cooling the leaf surface as water evaporates, which helps in regulating temperature.
- **Maintain Shape and Structure of Plant**: The loss of water creates a negative pressure that helps maintain turgor pressure in plant cells, thus keeping the plant's shape and structure intact.
- **Help in Translocation of Sugars from Source to Sink**: Transpiration creates a tension in the xylem that assists in the movement of water and nutrients, including sugars, from the source (where they are produced) to the sink (where they are used or stored).
- **Provide Water for Photosynthesis**: While water is essential for photosynthesis, transpiration itself does not provide water for this process. Instead, water is absorbed from the soil through the roots.

3. **Identifying the Incorrect Function**: Among the listed functions, the statement "provide water for photosynthesis" is not a function of transpiration. Instead, it is the absorption of water that supports photosynthesis, not the transpiration process itself.

4. **Conclusion**: The function that is not associated with transpiration is the one stating that it provides water for photosynthesis.

**Final Answer**: The function that is not associated with transpiration is "help in translocation of sugars from source to sink."

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