Question

Harmful effects of air pollution depend on which among the following factors?
I. Concentration of pollutants
II. Duration of exposure
III. The organism

• A. I and II
• B. I and III
• C. II and III
• D. I, II and III

Answer 1

The correct option is D I, II and III

The undesirable change in the physical, chemical or biological characteristics of air is referred to as air pollution.

Agents that cause such undesirable changes in the quality of the air are known as air pollutants.

Air pollutants have the ability to cause damage to living organisms as all organisms depend on air to fulfil their respiratory needs. Air pollutants majorly affect the respiratory system of humans and animals.

In plants, they reduce growth and yield of crops and cause premature death.

Harmful effects depend on the following factors:

• I. Concentration of pollutants – The greater the concentration of pollutants, the greater would its harmful effect be.
• II. Duration of exposure – The duration of exposure to air pollutants is directly proportional to the degree of harm it can cause
• III. The organism – The tolerance to pollutants varies among different organisms. Lichens, being extremely sensitive to air pollution, fail to grow in polluted areas and thereby act as indicators of air pollution.