Which of the following conditions shows the polluted environment.
(i) pH of rainwater is 5.6.
(ii) amount of carbon dioxide in the atmosphere is 0.03%.
(iii) biochemical oxygen demand 10 ppm.
(iv) eutrophication.

Answers (1)

The answer is the option (iii) biochemical oxygen demand 10 ppm and (iv) eutrophication

Explanation: Water having BOD less than 5ppm is considered as pure water, whereas water having BOD more than 5 ppm is considered as polluted. Therefore, BOD 10ppm will be highly polluted water.

Eutrophication is the process where the water is nutrient-rich but has a dense population; it kills animal life by depriving it of oxygen and results in loss of biodiversity.

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