Question

Which of the following will be reduced in air in a city forest when a lot of dust and fly ash in emitted by a coal-based factory in the vicinity?
A. nitrogen
B. carbon dioxide
C. oxygen
D. water vapour

Answer 1

Answer:C. Oxygen

Explanation:The various air pollutants discharged by motor vehicle and by the burning of fossil fuel in a factory are carbon dioxide, carbon monoxide, nitrogen oxides and smoke. It results in the decrease in the amount of oxygen in the air.

Answer 2

C. Oxygen gas will be reduced in air in a city forest when a lot of dust and fly ash in emitted.

Explanation:

• All the living organisms in earth depend on only gas oxygen for respiration.
• Oxygen is produced only by plants and through photosynthesis.
• When fly ash and dust gets increased in air, the leaves are shed from sunlight.
• This reduces the rate of photosynthesis.
• The dust and fly ash also cause increase in leaf temperature, transpiration and stomatal conductance.
• This also leads to increase in carbon dioxide concentration and heat load.