Which of the following is a degradable pollutant? 

Discarded vegetables 

The correct answer is option 3. Discarded vegetables.

Degradable pollutants are substances that can be broken down or decomposed by natural processes over time. Discarded vegetables fall into the category of degradable pollutants. Here's an explanation:

1. Biodegradability:

Discarded vegetables, being organic materials, are biodegradable. Biodegradation refers to the breakdown of organic substances by microorganisms (such as bacteria and fungi) into simpler and environmentally benign compounds.

2. Natural Decomposition:

When vegetables are discarded, they undergo natural decomposition processes. Microorganisms in the soil break down the organic matter in vegetables, turning them into simpler compounds, water, and carbon dioxide.

3. Nutrient Recycling:

The decomposition of organic matter from discarded vegetables contributes to nutrient recycling in the ecosystem. The breakdown releases nutrients back into the soil, enriching it for plant growth.

4. Contrast with Non-Degradable Pollutants:

In contrast to non-degradable pollutants, such as certain plastics and metals, which persist in the environment for extended periods and can cause long-term environmental issues, degradable pollutants break down more readily.

5. Environmental Impact:

While degradable pollutants like discarded vegetables can be naturally assimilated into the environment without causing long-term harm, it is essential to consider proper waste management practices. In some cases, when organic waste is not managed appropriately, it can lead to issues like the production of methane gas in anaerobic conditions (such as landfills).

6. Sustainable Practices:

Proper composting or recycling of organic waste, including discarded vegetables, is a sustainable practice that harnesses the benefits of biodegradation while minimizing potential negative environmental impacts.

In summary, discarded vegetables are degradable pollutants that undergo natural decomposition processes, contributing to nutrient recycling in the environment. Proper waste management practices are crucial to harness the benefits of biodegradation while minimizing potential environmental issues.