Lichens are the best indicator of
A
Air pollution
B
Sound pollution
C
Noise pollution
D
Water pollution
Correct Answer: Air pollution
1. Lichens are plants that grow in exposed places such as rocks or tree bark.
2. Lichens are widely used as environmental indicators or bio-indicators. They can be used as air pollution indicators, especially of the concentration of sulfur-di-oxide in the atmosphere.
3. They need to be very good at absorbing water and nutrients to grow there.
