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Question

Which of the following does not cause water pollution?


A

Domestic Waste

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B

Insecticides and Herbicides

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C

Heavy Metals

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D

Dissolved Oxygen

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Solution

The correct option is D

Dissolved Oxygen


The correct option is :D.

The explanation for the correct option:

  1. Water pollution refers to the contamination of the water bodies like rivers, lakes, canals, ponds, and seas.
  2. It is caused by industrial and agricultural waste.
  3. Dissolved oxygen does not cause water pollution as it decreases biological oxygen demand and helps organisms to survive.

The explanation for the incorrect options:

Option A

Domestic wastes cause water pollution as it increases eutrophication and biological oxygen demand increases which leads to pollution and the death of organisms.

Option B

Insecticides and pesticides cause water pollution.

Option C

Heavy metals also cause water pollution.

Final answer: Dissolved oxygen does not cause water pollution.


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