Prolonged water-logging kills plant due to

Options

A. Stoppage of root respiration
B. Dilution of soil nutrients
C. Dilution of plant cell sap
D. Leaching of nutrients .

Answer

**Step-by-Step Solution:**

1. **Understanding Water-Logging**: Water-logging refers to the saturation of soil with water, which prevents air from reaching the roots of plants. This condition can occur due to excessive rainfall or poor drainage.

2. **Impact on Soil Aeration**: When the soil is water-logged, the air spaces in the soil become filled with water. This leads to a lack of oxygen in the soil, which is essential for root respiration.

3. **Role of Oxygen in Root Respiration**: Roots require oxygen to carry out respiration, a process that converts glucose into energy, allowing the plant to grow and function properly. Without oxygen, roots cannot respire effectively.

4. **Consequences of Stoppage of Root Respiration**: If root respiration is halted due to lack of oxygen, the plant cannot produce the energy it needs. This can lead to wilting, nutrient deficiencies, and ultimately, the death of the plant.

5. **Evaluating Other Options**:
- **Dilution of Soil Nutrients**: While water-logging can lead to nutrient loss, the primary cause of plant death in this scenario is the lack of oxygen.
- **Dilution of Plant Cell Sap**: This is not a direct cause of death due to water-logging.
- **Leaching of Nutrients**: Although leaching can occur with excessive water, it is not the primary reason for plant death in prolonged water-logging situations.

6. **Conclusion**: The correct answer to the question is that prolonged water-logging kills plants due to the stoppage of root respiration.

**Final Answer**: Prolonged water-logging kills plants due to the stoppage of root respiration.

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