Thermal pollution, Water Pollution - GS questions based on daily current affairs

1)   Which of the following statement / s is / are correct?

1) Eutrophication is excessive enrichment by nutrients like phosphorus and nitrogen.
2) Eutrophication is a phenomenon exclusive to water bodies, wetlands or aquatic ecosystems.
3) Biomagnification phenomenon is seen on land based food chains as opposed to eutrophication seen in water bodies.

a. Only 1
b. Only 2 and 3
c. Only 1, 2 and 3
d. All of the above
Answer  Explanation 

ANSWER: Only 1

Explanation:
Eutrophication of soil is also seen. Biomagnification can also be seen in aquatic foodchains.
2)   Which of the following are effects of water pollution?

1) Eutrophication
2) Biomagnification
3) Water borne diseases
4) Thermal stress
5) Biochemical oxygen demand decreases

a. Only 1, 3, 4 and 5
b. Only 1, 2, 3 and 4
c. Only 1, 3 and 4
d. All of the above
Answer  Explanation 

ANSWER: Only 1, 2, 3 and 4

Explanation:
Chemicals in water are eaten by organisms. These organisms are then eaten by others thus leading to biomagnifications. Also due to excessive organic water pollutants, the Biochemical oxygen demand increases leading to lack of oxygen for others in the water.

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