Discussion
Eutrophication is caused due to :
Answer: D
Eutrophication is caused by agricultural run off and domestic sewage.
Eutrophication is the enrichment of lakes and slow rivers with nutrients, chiefly nitrogen and phosphorus. Fertiliser washed off farms and sewage carrying detergents and human waste supply these nutrients, causing algal blooms. When the algae die and decay, bacteria use up the dissolved oxygen, and fish and bottom life suffer.
Transport, industrial and biomass burning emissions are air pollutants. They can add some nitrogen through deposition, but the main and direct causes of eutrophication are the nutrient-rich runoff and sewage reaching the water.
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