Biochemical Oxygen Demand (BOD) may not be a good index for pollution in water bodies receiving effluents from?

1. domestic sewage

2. dairy industry

3. petroleum industry

4. sugar industry

An increase in the concentration of the toxicant at successive trophic levels is known as:

1. Biomagnifications

2. Biodeterioration

3. Biotransformation

4. Biogeochemical cycling

Eutrophication of water bodies leading to the killing of fishes is mainly due to non-availability of:

1. Food

2. Light

3. Essential minerals

4. Oxygen

Which of the following is not one of the prime health risks associated with greater UV radiation through the atmosphere due to the depletion of the stratospheric zone?

The zone of atmosphere in which the ozone layer is present is called:

1. Ionosphere

2. Mesosphere

3. Stratosphere

4. Troposphere

A scrubber in the exhaust of a chemical industrial plant removes:

1. Gases like sulphur dioxide

2. Particulate matter of the size 5 micrometer or above

3. Gases like ozone and methane

4. Particulate matter of the size 2.5 micrometer or less

Global warming can be controlled by:

In an area where DDT had been used extensively, the population of birds declined significantly because:
1. Birds stopped laying eggs
2. Earthworms in the area got eradicated
3. Cobras were feeding exclusively on birds
4. Many of the birds laid eggs, but the eggs did not hatch