Environmental Science - Study Mode

[#281] The presence of high coliform counts in water indicates
Correct Answer

(A) contamination by human wastes

Explanation

Solution: The presence of high coliform counts in water indicate contamination by human wastes. Coliform bacteria or Escherichia coli is a bacteria that is present in human intestine. It is a useful bacteria. When people discharge fecal matter near water bodies these microorganisms enter water.

[#282] As it travels along the food chain, the concentration of DDT
Correct Answer

(A) increases

Explanation

Solution: As it travels along the food chain, the concentration of DDT increases.

[#283] Industrial melanism is an example of
Correct Answer

(D) darkening of skin due to industries

Explanation

Solution: Industrial melanism refers to the evolution of dark body colours in animal species that live in habitats blackened by industrial soot. The phenomenon has been documented in numerous species that hide from predators by blending in with their backgrounds. Peppered moths provide one example.

[#284] Coal is a __________ resource.
Correct Answer

(C) deforestation

Explanation

Solution: Coal is a deforestation resource.

[#285] Extensive planting of trees to increase forest cover is called
Correct Answer

(A) Afforestation

Explanation

Solution: The process of extensive planting of trees or seeds in barren lands to increase forest cover is called as Afforestation.