Untreated sewage contaminates Ganga because

it contains micro-organisms

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it lowers the pressure of water

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it increases the buoyancy of water

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it makes the water dense

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Solution

The correct option is A
it contains micro-organisms

Untreated sewage contains lot of microorganisms that can give rise to many diseases such as typhoid, diarrhea, etc. Hence sewage must be treated before it is dumped into rivers.

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Similar questions

Untreated sewage contaminates Ganga because it ____

Q. Assertion (A): Untreated sewage when discharged into natural water bodies may cause the death of fishes.
Reason (R): It increases the BOD of water.

If untreated sewage is discharged into water bodies it will clean the water resources.

Sewage containing organic waste should not be disposed in water bodies because it causes major water pollution.Fishes in such a polluted water die because __________

If untreated sewage is discharged into rivers and seas, it will ____ the water resources.

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Untreated sewage contaminates Ganga because

The correct option is A it contains micro-organisms Untreated sewage contains lot of microorganisms that can give rise to many diseases such as typhoid, diarrhea, etc. Hence sewage must be treated before it is dumped into rivers.

The correct option is A
it contains micro-organisms

Untreated sewage contains lot of microorganisms that can give rise to many diseases such as typhoid, diarrhea, etc. Hence sewage must be treated before it is dumped into rivers.