why lichens called as bioindicators of air polution
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The hardy lichens 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. It also helps that they are able to react to air pollutants all year round.
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Lichens are called as bioindicators of air pollution and these don't grow in places where there is high concentration of sulphur. therefore these are called as bioindicators of air pollution.
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