Question

42. Which of the following does not cause air pollution?

• A. Plants
• B. Cool engines
• C. Vehicles
• D. Burning leaves

Answer 1

The correct option is A

Plants

Explanation of correct option:

(A) Plants:

• The plant absorbs pollutants and filters the harmful substances from the air.
• Example: Plant absorb carbon dioxide and release oxygen in the process of photosynthesis.

Explanation of incorrect option:

(B) Cool engines:

• Cool engines produce a large number of pollutants like carbon monoxide.

(C) Vehicles:

• It produces carbon monoxide and excess carbon dioxide which polluted the air.

(D) Burning leaves:

• It contains harmful chemicals like carbon monoxide which can mix with blood and reduce the amount of oxygen in the blood.

Conclusion: Hence, option (A) is correct.