Water exudation through hydathodes is

Options

A. Guttation
B. Transpiration
C. Hydrolysis
D. Excretion

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the process of water exudation through hydathodes. Hydathodes are specialized structures found in plants that facilitate the release of water.

2. **Identifying the Process**: The process of water exudation through hydathodes is known as "guttation." This is a specific term used to describe the loss of water in liquid form from the plant.

3. **Defining Guttation**: Guttation occurs when water is expelled from the plant, particularly from the margins of leaves. This happens when the transpiration rate is low, and the plant is absorbing more water than it is losing.

4. **Role of Root Pressure**: The phenomenon of guttation is often associated with root pressure. When the roots absorb water, it creates pressure that pushes the water upward through the plant and out through the hydathodes.

5. **Distinguishing from Other Processes**:
- **Transpiration**: This is the process of water loss in the form of vapor through stomata, primarily during the day.
- **Hydrolysis**: This refers to a chemical reaction involving water that breaks down larger molecules into smaller ones.
- **Excretion**: This is the removal of waste products from the plant.

6. **Conclusion**: Based on the definitions and processes discussed, the correct answer to the question is "guttation."

**Final Answer**: Water exudation through hydathodes is known as guttation.

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