Write a note on lichens.
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LICHEN
- Thallophytic plant.
- Occurs at crusty patches or bushy growths on tree trunk or rock or bare grounds etc.
- Lichen includes Blue green algae or algae and fungi.
Characteristics of lichen
- It is the indicator of SO2 pollution.
- Lichen is a example of mutualism.
Mutualism
- The relation between two different species of organism that are interdependent , each gains benefits from other.
- They are co-evolution.
- They are co-extinction.
- They are co-existance.
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