Question

Accelerated eutrophication occurs due to

• A. increase in amount of dissolved oxygen
• B. disposal of waste rich in nitrates and phosphates
• C. increase in concentration of $DDT$ and mercury in water
• D. unsafe disposal of radioactive wastes

Answer 1

Answer: (B)

disposal of waste rich in nitrates and phosphates

Answer 2

Cultural or accelerated eutrophication is nutrient enrichment of water bodies due to human activities like passage of sewage, industrial effluents and runoff from fertilised fields rich in nitrates and phosphates. Nutrients present in sewage, agriculture wastes and fertilisers cause dense growth of plants and planktonic algae.