Question

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 of ______.

Options

• Large number of mosquitoes.

• Increase in the amount of dissolved oxygen.

• Decrease in the amount of dissolved oxygen in water.

• Clogging of gills by mud.

Answer 1

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 of decrease in the amount of dissolved oxygen in water.

Explanation:

Organic waste consumes oxygen and therefore, dissolved oxygen in water decreases and fish in such polluted water die.