Match the pollutants given in Column I with their effects given in Column II.
| Column I | Column II | ||
|---|---|---|---|
| A. | Phosphate fertilisers in water | 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 air | 4. | Eutrophication |
A. $\rightarrow(1,4)$
B. $\rightarrow(3)$
C. $\rightarrow(1)$
D. $\rightarrow(2)$
A. Phosphate fertilisers increase growth of algae increasing BOD level, causing eutrophication.
B. Methane oxidises to $\mathrm{CO}_2$ which causes, global warming.
C. Synthetic detergents increases BOD level.
D. Nitrogen oxide mix with water forming nitric acid.
Assertion (A) Green house effect was observed in houses used to grow plants and these are made of green glass.
Reason (R) Green house name has been given because glass houses are made of green glass.
Assertion (A) The pH of acid rain is less than 5.6.
Reason (R) Carbon dioxide present in the atmosphere dissolves in rain water and forms carbonic acid.
Assertion (A) Photochemical smog is oxidising in nature.
Reason (R) Photochemical smog contains $\mathrm{NO}_2$ and $\mathrm{O}_3$, which are formed during the sequence of reactions.
Assertion (A) Carbon dioxide is one of the important green house gases.
Reason (R) It is largely produced by respiratory function of animals and plants.