Lichens are pollution indicators.justify the statement by giving suitable reason
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Lichens are mutualistic associations of a fungus and an alga and occur as crusty or Continuous patches or bushy growths on trees, rocks and bare ground.
- Lichens are very sensitive to sulphur dioxide pollution in the air. Since industrialisation, many lichen species have become extinct in large areas
- Lichens are widely used as environmental indicators or bio-indicators. If air is very badly polluted with sulphur dioxide there may be no lichens present, just green algae may be found.
- If the air is clean, shrubby, hairy and leafy lichens become abundant. A few lichen species can tolerate quite high levels of pollution and are commonly found on pavements, walls and tree bark in urban areas.
- Lichens are injured by sulphur dioxide (SO2).Lichens have also shown sensitivity to some other pollutants, such as heavy metals and Other Gaseous Toxics in Air , but for the most part lichen damage can be attributed to SO2.
- Lichens are very sensitive to sulphur dioxide pollution in the air. Since industrialisation, many lichen species have become extinct in large areas
- Lichens are widely used as environmental indicators or bio-indicators. If air is very badly polluted with sulphur dioxide there may be no lichens present, just green algae may be found.
- If the air is clean, shrubby, hairy and leafy lichens become abundant. A few lichen species can tolerate quite high levels of pollution and are commonly found on pavements, walls and tree bark in urban areas.
- Lichens are injured by sulphur dioxide (SO2).Lichens have also shown sensitivity to some other pollutants, such as heavy metals and Other Gaseous Toxics in Air , but for the most part lichen damage can be attributed to SO2.
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