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प्रश्न
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 ______.
विकल्प
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.
उत्तर
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.
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