A) Water cycle in the area got unbalanced
B) Electronic wastes were being dumped in a nearby area
C) A factory with heavy smoke discharge has been established nearby
D) Heavy amount of chemical fertilizers were being used in a nearby field
Correct Answer: D
Solution :
Chemical fertilizers are rich in nitrogen and phosphorus. When they are used in a crop field in excess amount, they may wash down into nearby water bodies with runoff water. This increases the nitrogenous content of the water body which favours algal growth.
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