Question

Which is used as an air pollution indicator?

• A. Algae
• B. Fungi
• C. Bacteria
• D. Lichens

Hint:

Lichens are an excellent indicator of air quality, particularly in terms of sulfur dioxide levels.

Answer 1

The Correct Option is D

Lichens are often used as indicators of air pollution, particularly sulfur dioxide pollution. This is because lichens are sensitive to atmospheric changes due to their unique structure and method of nutrient absorption.

Lichens consist of a symbiotic relationship between a fungus and an alga (or cyanobacterium). They do not have typical root systems and receive nutrients and moisture directly from the air. This makes them highly susceptible to pollutants present in the atmosphere, such as sulfur dioxide, which can be detrimental to their health and growth.

Due to their sensitivity, the presence or absence of certain lichen species can indicate the quality of the air in an area. Areas with significant air pollution often have fewer lichen species, whereas areas with clean air may have a diverse and abundant lichen population.

In summary, lichens are utilized as biological indicators for air pollution monitoring, providing valuable insights into environmental conditions.