DDT cannot be broken down or converted to harmless state by natural processes of oxidation or biological decomposition. Hence it is non biodegradable.

Correct Option: A

DDT cannot be broken down or converted to harmless state by natural processes of oxidation or biological decomposition. Hence it is non biodegradable.

MIC ? (Methyl Isocyanate) was the deadly gas leaked from the fertilizer plant of Union Carbide company in Bhopal.

Correct Option: A

MIC ? (Methyl Isocyanate) was the deadly gas leaked from the fertilizer plant of Union Carbide company in Bhopal.

Organic pollutants provide nutrients for stimulating growth of algae and other plants. Algal bloom reduces availability of light to submerged plants which get killed. The dead submerged plants consume more oxygen in decomposition. This reduces availability of oxygen to other life forms leading to death of organisms. This is known as eutrophication.

Correct Option: D

Organic pollutants provide nutrients for stimulating growth of algae and other plants. Algal bloom reduces availability of light to submerged plants which get killed. The dead submerged plants consume more oxygen in decomposition. This reduces availability of oxygen to other life forms leading to death of organisms. This is known as eutrophication.

Organisms found in the higher trophic level show greater accumulation of pesticides due to the phenomenon of biomagnification - which is defined as the gradual increase in concentration of harmful pesticides in the food chain, with increase in trophic level.

Correct Option: C

Organisms found in the higher trophic level show greater accumulation of pesticides due to the phenomenon of biomagnification - which is defined as the gradual increase in concentration of harmful pesticides in the food chain, with increase in trophic level.

E. coli lives in the human intestine. If they are present in water it indicates that the water is polluted. E.coli coliform count test is done to test the quality of water.

Correct Option: C

E. coli lives in the human intestine. If they are present in water it indicates that the water is polluted. E.coli coliform count test is done to test the quality of water.