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Question
Match the pollutants given in Column I with their effects given in Column II.
| Column I | Column II |
| (i) Phosphate fertilisers in water | (a) BOD level of water increases |
| (ii) Methane in air | (b) Acid rain |
| (iii) Synthetic detergents in water | (c) Global warming |
| (iv) Nitrogen oxides in air | (d) Eutrophication |
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Solution
| Column I | Column II |
| (i) Phosphate fertilisers in water | (a) BOD level of water increases, (d) Eutrophication |
| (ii) Methane in air | (c) Global warming |
| (iii) Synthetic detergents in water | (a) BOD level of water increases |
| (iv) Nitrogen oxides in air | (b) Acid rain |
Explanation:
(i) Phosphate fertilizers increase growth of algae, increasing BOD level and causing eutrophication.
(ii) Methane oxidises to CO2 which causes global warming.
(iii) Use of synthetic detergents increases BOD level of water.
(iv) Nitrogen oxides present in air combine with water forming nitric acid.
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