Question
Biology Question on Environmental Issues
Which one is not a pollutant normally?
A
hydrocarbon
B
carbon dioxide
C
carbon monoxide
D
sulphur dioxide.
Answer
carbon dioxide
Explanation
Solution
The common gaseous pollutants are oxides of carbon (CO and CO), oxides of nitrogen (NO and NO) oxides of sulphur (SO and S0), all these together contribute 90% of the global air pollution. Out of all these CO is not a pollutant normally, the green plants, by photosynthesis balance the CO and O ratio in the air to a great extent, whereas others like carbon monoxide, NO etc are poisonous gases.