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 a lot of microorganisms that can give rise to many diseases such as typhoid, diarrhoea, 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.

If untreated sewage is discharged into rivers and seas, it will ____ 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 __________

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Untreated sewage contaminates Ganga because:

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

The correct option is A
it contains micro-organisms

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