Root pressure is observed when absorption of water is ___ and loss of water is ___.

Options

A. High, High
B. Low, Low
C. High, Low
D. Low, High

Answer

To answer the question "Root pressure is observed when absorption of water is ___ and loss of water is ___", we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Root Pressure**:
- Root pressure is a positive pressure that develops in the roots of plants. It is essential for the upward movement of water and nutrients from the roots to the leaves.

2. **Role of Water Absorption**:
- Roots absorb water and minerals from the soil. When the absorption of water is high, it creates a buildup of pressure within the roots. This pressure is what contributes to the root pressure.

3. **Loss of Water**:
- The loss of water from the plant primarily occurs through transpiration, which is the evaporation of water from the leaves. For root pressure to be effective, the loss of water must be low. If the loss of water is high, it can lead to a negative pressure (transpirational pull) that counteracts the root pressure.

4. **Combining the Observations**:
- Therefore, root pressure is observed when:
- The absorption of water is **high** (to create pressure).
- The loss of water is **low** (to maintain that pressure).

5. **Selecting the Correct Option**:
- Based on the above analysis, the correct answer is that root pressure is observed when absorption of water is **high** and loss of water is **low**.

### Final Answer:
Root pressure is observed when absorption of water is **high** and loss of water is **low**.