1.

The condition that indicates a polluted environment is (1) BOD value of 5 ppm (2) eutrophication (3) 0.03% of CO2 in the atmosphere (4) pH of rain water to be 5.6

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(2) eutrophication

In Eutrophication nutrient enriched water bodies support a dense plant population, which kills animal life by depriving it of oxygen and results in subsequent loss of biodiversity. If indicates polluted environment.



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