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 __________

Large number of mosquitoes

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Increase in amount of dissolved oxygen

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Decrease in amount of dissolved oxygen in water

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Clogging of gills by mud

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Solution

The correct option is C
Decrease in amount of dissolved oxygen in water

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 it decrease the amount of dissloved oxygen in water. when sewage water is let into water bodies there is growth of algae which produces lot of nutrients ,which in turn decreases the oxygen content.

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Similar questions

The amount of oxygen dissolved in water increases due to increased water pollution.

Q. A fish survives in water because of the dissolved oxygen present in it.

Question 5
Fishes breathe with the help of gills which are richly supplied with blood vessels. The gills help the fish to

(a) take in oxygen from air.
(b) take in oxygen dissolved in water
(c) absorb nutrients present in water
(d) release waste substances in water

Q. Assertion (A): Thermal pollution is harmful to aquatic organisms.
Reason (R): Increase in temperature of water bodies reduces the dissolved oxygen level of the water.

Q. Organic matter is considered as a major source of water pollution caused by wastes of food, animal and human excreta, garbage etc. The excess of organic matter in water causes a threat to aquatic life because ?

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