Question

How lichens act as pollution indicator?

Answer 1

Answer:

Lichens are sensitive towards SO2 hence when exposed they couldn't survive and act like pollution indicators..

Answer 2

Explanation:

Lichens are regarded as pollution indicators because they are sensitive to sulphur dioxide (SO2) and do not grow in polluted areas. Their presence indicates the absence of pollution in an area, and their absence indicates that the area is polluted.