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
(a) large number of mosquitoes
(b) increase in the amount of dissolved
oxygen
(c) decrease in the amount of dissolved
oxygen in water
(d) clogging of gills by mud.

Answer 1

Answer:

the correct answer is option (c)

Answer 2

(c) decrease in the amount of dissolved oxygen in water

Explanation:

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. Dissolved oxygen is essential for aquatic life. Organic waste is oxidized by microorganisms using dissolved oxygen, thus oxygen from water decreases. It is harmful for aquatic life.

Option C is the answer.