Sewage water is purified for recycling by the action of

Options

A. Light
B. Microorganisms
C. Aquatic plants
D. Fishes

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks about the process through which sewage water is purified for recycling.

2. **Analyzing the Options**: We have four options:
- A) Light
- B) Microorganisms
- C) Aquatic plants
- D) Fishes

3. **Evaluating Each Option**:
- **Option A: Light** - Light cannot purify sewage water. It does not have any direct role in the breakdown of impurities in sewage.
- **Option B: Microorganisms** - Microorganisms are known to play a crucial role in the decomposition of organic matter. They can break down complex organic substances present in sewage into simpler, less harmful substances.
- **Option C: Aquatic Plants** - Aquatic plants typically require oxygen to survive. Sewage water often has low oxygen levels, making it unsuitable for many aquatic plants to thrive and purify the water.
- **Option D: Fishes** - Fishes also require a certain level of oxygen to survive and cannot live in heavily polluted sewage water.

4. **Conclusion**: After analyzing all the options, the most suitable answer is **Microorganisms**. They are essential for the biological treatment of sewage, utilizing both aerobic (requiring oxygen) and anaerobic (not requiring oxygen) processes to purify the water.

5. **Final Answer**: Sewage water is purified for recycling by the action of **Microorganisms**.

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