Question

Which one of the following is a useful biological indicator of Sulphur-dioxide pollution?

• A. Bryophytes
• B. Algal blooms
• C. Pseudomonas
• D. Lichens

Hint:

Lichens thrive in clean environments and their absence or poor growth indicates the presence of pollutants like sulfur dioxide.

Answer 1

The Correct Option is D

Lichens are known to be sensitive to air pollution, particularly sulfur dioxide. They are often used as biological indicators of air quality in environments exposed to such pollutants.