Question:
Which of the following conditions shows the polluted environment.
(i) a 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
Solution:
Option (iii) biochemical oxygen demand 10 ppm and (iv) eutrophication are the answers.
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