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.

El. Nino flows to the north from Antarctica along the west coast of South America to S. Ecuador, the west. It reoccurs after every 5 to 8 yrs. El Nino and La Nina are officially defined as sustained sea surface temperature anomalies of magnitude greater than 0.5°C across the central tropical Pacific Ocean. When the condition is met for a period of less than five months, it is classified as El Nino or La Nina conditions; if the anomaly persists for five months or longer, it is classified as an El Nino or La Nina episode.

Correct Option: B

El. Nino flows to the north from Antarctica along the west coast of South America to S. Ecuador, the west. It reoccurs after every 5 to 8 yrs. El Nino and La Nina are officially defined as sustained sea surface temperature anomalies of magnitude greater than 0.5°C across the central tropical Pacific Ocean. When the condition is met for a period of less than five months, it is classified as El Nino or La Nina conditions; if the anomaly persists for five months or longer, it is classified as an El Nino or La Nina episode.

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.

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.

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.