Question

Eutrophication of water bodies leading to killing of fishes in mainly due to

• A. Non-availability of oxygen
• B. Non-availability of light
• C. Non-availability of food
• D. Non-availability of essential minerals

Answer 1

The correct option is A Non-availability of oxygen

Eutrophication is the buildup of biomass due to excessive inorganic nutrients in the water body. The dead biomass would then be subjected to the decomposition by the bacteria that would use the dissolved oxygen in the water body. The concentration of the oxygen would fall and this causes the death of the aquatic animals due to the suffocation. Hence, the correct answer is 'Non-availability of oxygen’.