Phenomenon of guttation

Options

A. Is regulated by Cohesion-Tension
B. Is due to active solute accumulation by phloem
C. Takes place to release excessive solutes
D. More than one option is correct

Answer

### Step-by-Step Text Solution for the Phenomenon of Guttation

1. **Definition of Guttation**: Guttation is the process through which plants exude water droplets containing dissolved substances (solutes) from special pores known as hydathodes, located at the leaf tips and margins.

2. **Conditions for Guttation**: This phenomenon typically occurs under specific conditions, particularly during the early morning when temperatures are low and the rate of transpiration is minimal.

3. **Role of Hydathodes**: Hydathodes are specialized structures that facilitate the release of water and solutes. They are crucial for the guttation process, allowing plants to manage excess solutes effectively.

4. **Connection to Root Pressure**: Guttation is primarily associated with root pressure, which is the pressure exerted by the roots of the plant that pushes water and nutrients upward through the plant. This is particularly relevant in small herbaceous plants and grasses.

5. **Distinction from Transpiration**: Unlike transpiration, which involves the loss of water vapor from the aerial parts of the plant, guttation occurs when the transpiration rate is low. Therefore, it is not driven by the cohesion-tension mechanism that governs transpiration.

6. **Correct Option Identification**: Among the provided options regarding guttation, the correct statement is that it takes place to release excessive solutes. The other options, which suggest that guttation is due to active solute accumulation by the phloem or is connected to the cohesion-tension mechanism, are incorrect.

### Summary of the Correct Answer
The correct answer regarding the phenomenon of guttation is that it occurs to release excessive solutes from the plant through hydathodes.

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