why lichens are called good pollution indicators
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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.
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Lichens are good pollution indicators beacause their symbiotics partners are fungus and algea that use the salts,minirals and pollutants as their photosynthetic reagents for food source .
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