Which one is non-biodegradable

Options

A. DDT
B. Sewage
C. Livestock waste
D. Market garbage.

Answer

### Step-by-Step Solution:

1. **Understanding Non-Biodegradable Substances**:
- Non-biodegradable substances are those that cannot be broken down or degraded by natural processes, including the action of microbes or chemical reactions.

2. **Analyzing the Options**:
- The question provides several options, and we need to determine which one is non-biodegradable.

3. **Evaluating Each Option**:
- **Option 1: DDT (Dichlorodiphenyltrichloroethane)**:
- DDT is a synthetic pesticide that is known for its persistence in the environment. It does not easily degrade and remains in the ecosystem for a long time. Thus, it is classified as non-biodegradable.
- **Option 2: Sewage**:
- Sewage is wastewater generated from homes, farms, and factories. It can be treated and broken down by microbial action, making it biodegradable.
- **Option 3: Livestock Waste**:
- Livestock waste, which comes from the farming of animals for meat, milk, and eggs, can also be decomposed by microbes, indicating that it is biodegradable.
- **Option 4: Market Garbage**:
- Market garbage consists of various organic and inorganic waste materials. While some components may be non-biodegradable, many organic materials can be decomposed by microbes, making this option generally biodegradable.

4. **Conclusion**:
- After evaluating all options, it is clear that **DDT** is the only substance that is non-biodegradable. Therefore, the correct answer is **Option 1: DDT**.