Ncert Exercises & Solutions

Match the pollutants given in Column I with their effects given in Column II.

Column I	Column II
A. increase in the concentration of phosphorus and nitrogen	1. BOD level of water increases
B. Methane in air	2. Acid rain
C. Synthetic detergents in water	3. Global warming
D. Nitrogen oxides in the air	4. Eutrophication

Codes

Hint: Methane in the air is also a cause of global warming.

A. Eutrophication, the gradual increase in the concentration of phosphorus, nitrogen, and other plant nutrients in an aging

aquatic ecosystem such as a lake.

B. Methane oxidizes to CO₂ which causes, global warming.

C. Synthetic detergents increases BOD level.

D. Nitrogen oxide mix with water forming nitric acid.