Water evaporation from plant parts is called :
(a) translocation
(b) transpiration
(c) guttation
(d) tension

Options

A. translocation
B. transpiration
C. guttation
D. tension

Answer

To solve the question "Water evaporation from plant parts is called:", we will analyze each option provided and identify the correct term that describes the process of water loss in plants.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that describes the process of water evaporation from plant parts.

2. **Analyzing the Options**:
- **Option (a) Translocation**: This refers to the movement of nutrients and water within the plant, not specifically the evaporation of water.
- **Option (b) Transpiration**: This is the process where water is absorbed by plant roots, moves through plants, and is released as vapor through stomata in the leaves. This is indeed the evaporation of water from plant parts.
- **Option (c) Guttation**: This is the process of water exuding from the tips or edges of leaves, usually in the form of droplets, which is different from evaporation.
- **Option (d) Tension**: This refers to the negative pressure created in the xylem due to transpiration, but it does not describe the evaporation process itself.

3. **Identifying the Correct Answer**: Based on the definitions and functions of each term, the correct answer is **(b) transpiration**. This term specifically refers to the loss of water vapor from plant parts, primarily through the stomata.

4. **Conclusion**: Therefore, the answer to the question is **(b) transpiration**.