Q.) Which one is true about guttation ?

Options

A. a) It occurs through specialised pores called hydathodes
B. b) It occurs in herbaceous plants when root pressure is low and transpiration is high
C. c) It only occurs during the day time
D. d) It occurs in plants growing under conditions of low soil moisture and high humidity

Answer

**Step-by-Step Solution:**

1. **Understand Guttation**: Guttation is the process by which plants exude water in the form of liquid droplets from specialized structures. It typically occurs at the tips of leaves, particularly in herbaceous plants.

2. **Identify the Structures Involved**: The specialized pores through which guttation occurs are called hydathodes. These structures facilitate the release of excess water from the plant.

3. **Analyze the Conditions for Guttation**: Guttation occurs primarily at night or in the early morning when transpiration (the loss of water vapor from the plant) is minimal. This is when root pressure is typically high due to the uptake of water by the roots.

4. **Evaluate Each Option**:
- **Option A**: "It occurs through specialized pores called hydathodes." - This is true, as guttation does occur through hydathodes.
- **Option B**: "It occurs in herbaceous plants when root pressure is low and transpiration is high." - This is false; guttation occurs when root pressure is high and transpiration is low.
- **Option C**: "It occurs only during the daytime." - This is false; guttation occurs at night or early morning.
- **Option D**: "It occurs in plants growing under conditions of low soil moisture and high humidity." - This is false; guttation requires high soil moisture.

5. **Conclusion**: The correct answer is **Option A**: "It occurs through specialized pores called hydathodes."

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