Multiple Choice Question Answer VI — task. Science CBSE, Class 9.

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1. Which of the following is the main factor of water pollution ?

Detergents
Industrial wastes
Ammonia
Pesticides

2. Often in water bodies subjected to sewage pollution, fishes die because of the:

Pathogens released by sewage
Foul smell
Reduction of dissolved oxygen caused by microbial activity
Clogging of their gills by solid substances

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