Exudation

Options

A. A) takes place during positive root pressure
B. B) takes place during negative root pressure
C. C) is unrelated with root pressure
D. D) is related with photosynthesis

Answer

**Step-by-Step Solution:**

1. **Understanding Exudation**: Exudation refers to the process where plants release liquid substances, which can occur through various mechanisms. In the context of plants, it is often associated with the release of water and solutes from the leaves.

2. **Identifying the Process**: One specific type of exudation is called guttation. Guttation is the secretion of droplets of water from the edges of leaves, which occurs when root pressure is high.

3. **Root Pressure**: Root pressure is the pressure exerted in the roots of plants that helps in the upward movement of water and nutrients. It is generated when water is absorbed from the soil, creating a pressure that pushes water up through the plant.

4. **Positive Root Pressure**: Positive root pressure occurs when there is an excess of water absorption by the roots, leading to an increase in pressure. This condition is conducive to guttation, as it forces water out of the leaf margins.

5. **Conclusion**: Therefore, the exudation of liquid drops from the margins of leaves, known as guttation, takes place during positive root pressure. Hence, the correct answer to the question regarding exudation is that it occurs during positive root pressure.

**Final Answer**: Exudation occurs during positive root pressure, specifically through the process of guttation.

---