Addition of KCN reduces the rate of water absorption in the root. This indicates the water absorption is a/an:

Options

A. Passive process
B. Energy dependent process
C. Osmotic difference dependent process
D. Exchange diffusion process

Answer

To solve the question regarding the effect of KCN on water absorption in roots, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Water Absorption in Roots**:
- Water absorption in plant roots primarily occurs through root hairs. This process can be either passive or active.

2. **Identifying Passive vs. Active Transport**:
- **Passive Transport**: This does not require energy (ATP) and occurs due to concentration gradients (e.g., osmosis).
- **Active Transport**: This requires energy (ATP) to move substances against their concentration gradient.

3. **Analyzing the Effect of KCN**:
- KCN (potassium cyanide) is known to inhibit cellular respiration, which in turn reduces ATP production.
- If the addition of KCN reduces the rate of water absorption, it suggests that the process of water absorption is dependent on energy (ATP).

4. **Conclusion**:
- Since the addition of KCN decreases water absorption, it indicates that water absorption in roots is an **active process**. This means that water absorption requires energy, which is provided by ATP.

### Final Answer:
The water absorption in the roots is an **active process**.

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