The pollutants which are not degraded by microbes or degrade at a very slow rate:

1. Biodegradable pollutants
2. Primary pollutants
3. Quantitative pollutants
4. Non-Biodegradable pollutants

Unwanted sound that is an irritant and source of stress:

1. Air pollution
2. Radioactive pollution
3. Noise pollution
4. Soil pollution

Nuclear fuels produce pollution by …………….. .

1. heat
2. end products
3. wastes in coolants
4. All of the above.

Assertion (A): Eighty per cent of marine pollution comes from land.

Reason (R): Mining for materials such as copper and gold is a major source of contamination in the ocean.

1. Both A and R are true and R is one of the reasons for A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.