Select the non-degradable pollutant(s) from the following
I Plastic
II Organochloride pesticides .
III Heavy metals
IV. Domestic sewage

Options

A. I and II only are correct
B. II and III only are correct
C. l, ll and III are correct
D. I, II, III and IV are correct

Answer

To determine the non-degradable pollutants from the given options, we will analyze each option based on their degradability.

### Step-by-Step Solution:

1. **Identify the pollutants:**
We have four options to consider:
- I. Plastic
- II. Organochloride pesticides
- III. Heavy metals
- IV. Domestic sewage

2. **Analyze each option:**
- **Plastic (I):**
- Plastic is a synthetic material that does not decompose naturally. It can persist in the environment for hundreds of years, making it a non-degradable pollutant.

- **Organochloride pesticides (II):**
- Organochloride pesticides are chemical compounds that are resistant to degradation by microbial action. They can remain in the environment for a long time and accumulate in the food chain, classifying them as non-degradable pollutants.

- **Heavy metals (III):**
- Heavy metals, such as lead, mercury, and cadmium, do not degrade in the environment. They can accumulate in living organisms and are toxic, thus also categorized as non-degradable pollutants.

- **Domestic sewage (IV):**
- Domestic sewage contains organic matter that can be broken down by microorganisms. This process of biodegradation converts organic matter into simpler, inorganic substances, making domestic sewage a biodegradable pollutant.

3. **Conclusion:**
Based on the analysis:
- Non-degradable pollutants are:
- I. Plastic
- II. Organochloride pesticides
- III. Heavy metals
- The biodegradable pollutant is:
- IV. Domestic sewage

4. **Final Answer:**
The non-degradable pollutants from the options provided are I, II, and III.