Q. 21 Match the items in column I and column II and choose the correct option.
| Column I | Column II | ||
| A | UV | 1 | Biomagnification |
| B | Biodegradable organic matter | 2 | Eutrophication |
| C | DDT | 3 | Snow blindness |
| D | Phosphates | 4 | BOD |
The correct matches are
| Options: | A | B | C | D |
| 1. | 2 | 1 | 4 | 3 |
| 2. | 3 | 2 | 4 | 1 |
| 3. | 3 | 4 | 1 | 2 |
| 4. | 3 | 1 | 4 | 2 |
