India’s monument Taj Mahal is turning yellow due to filthy air and air pollution.
Oxidation of its constituents is caused because of the growing pollutants in air.
Dense smog created by human activities is slowly discoloring the marble.
Impacts of Air Pollution on plants are _____ .
Noise levels can be measured by an instrument called ___ .
A | B | C | D | Average |
---|---|---|---|---|
3 | 4 | 4 | ? | 4 |
3 | ? | 5 | ? | 4 |
? | 3 | 3 | ? | 4 |
? | ? | ? | ? | 4.25 |
4 | 4 | 4 | 4.25 |