Q6Multiple choice
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
- (i)Large number of mosquitoes.
- (ii)Increase in the amount of dissolved oxygen.
- (iii)Decrease in the amount of dissolved oxygen in water.
- (iv)Clogging of gills by mud.
Show answer
(iii) Decrease in the amount of dissolved oxygen in water.