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  • Which of the following conditions shows the polluted environment. (i) pH of rainwater is 5.6.

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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