Which of the following conditions shows
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.