Question

Why lichens are called bioindicator

Answer 1

HEY MATE

Bioindicators are living organisms that respond in an especially clear way to a change in the environment. The hardylichens are useful bioindicators for air pollution, espeially sulfur dioxide pollution, since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil.

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Answer 2

Since they derive their water and essential nutrients mainly from the atmosphere rather than from the soil it also helps that they are able to react to air pollutants all year round that is why they are called bioindicators.  Lichens are useful bioindicators for air pollution, especially sulfur dioxide pollution.