Consider the following statements about eutrophication I. Eutrophication is the natural ageing of a water body by nutrient enrichment II. The accelerated ageing of lakes due to sewage and agricultural and industrial wastes is called cultural or accelerated eutrophication III. The plant nutrients responsible for eutrophication are nitrates and phosphates IV. Phosphates and nitrates accelerate the growth of algae which utilise oxygen and may deoxygenate the water enough to kill the fish and other aquatic animals Which of the statements given above are correct?

Question

Dr. Abubacker · Accepted Answer

Eutrophication is excessive growth of algae, plants and animals in water-bodies due to the nutrient enrichment particularly with nitrogen and phosphorous. Eutrophication is both natural and accelerated. Natural eutrophication is nutrient enrichment of a water-body due to natural ageing Accelerated eutrophication is nutrient enrichment of water-bodies plants and due to human activities like passage of sewage, industrial effluents and run off from fertilised fields rich in nitrates and phosphates. Nutrients present in sewage, agriculture wastes and fertilisers cause dense growth of plants and planktonic algae. These are toxic to animals and humans

Explanation

Reviewed by Dr. Abubacker

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