Transpiration has more than one purpose. Which of the following is not the purpose of transpiration?
(a) Creates transpiration pull for absorption and transport in plants.
(b) Cools leaf surfaces by evaporative cooling
(c) Transports minerals from the soil to all parts of the plant.
(d) Gives high tensile strength to water column present in xylem.
(e) Translocation of sucrose from source to sink

Options

A. Creates transpiration pull for absorption and transport in plants.
B. Cools leaf surfaces by evaporative cooling
C. Transports minerals from the soil to all parts of the plant.
D. Gives high tensile strength to water column present in xylem.

Answer

To solve the question regarding the purposes of transpiration and identify which option is not a purpose, we can analyze each option provided:

1. **Understanding Transpiration**:
- Transpiration is the process of water loss from the aerial parts of the plant, primarily through small openings called stomata. It plays a crucial role in plant physiology.

2. **Evaluating Each Option**:
- **(a) Creates transpiration pull for absorption and transport in plants**: This is a true purpose of transpiration. The loss of water creates a negative pressure (transpiration pull) that helps in the uptake of water and nutrients from the roots.

- **(b) Cools leaf surfaces by evaporative cooling**: This is also a true purpose of transpiration. The evaporation of water from leaf surfaces helps in cooling the plant, preventing overheating.

- **(c) Transports minerals from the soil to all parts of the plant**: This is a true purpose as well. Water absorbed by the roots carries dissolved minerals upward through the xylem to various parts of the plant.

- **(d) Gives high tensile strength to water column present in xylem**: While the cohesion of water molecules does provide tensile strength to the water column in the xylem, this is not a direct purpose of transpiration itself. Instead, it is a physical property of water that aids in the process.

- **(e) Translocation of sucrose from source to sink**: This is not a purpose of transpiration. Translocation of sucrose occurs through the phloem, not the xylem, and is a separate process from transpiration.

3. **Conclusion**:
- The option that is not a purpose of transpiration is **(e) Translocation of sucrose from source to sink**.

### Final Answer:
The option that is not a purpose of transpiration is **(e) Translocation of sucrose from source to sink**.