Question

What are lichens? Where are they present.

Answer 1

lichens are the symbiotic association between algae and fungi in which fungi provide shelter and algae prepare food for fungi.
These are pollution indicators as they do not grow in polluted areas.
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Answer 2

Lichen is an organism formed from the symbiotic relationship of an alga and fungi. The lichen acquires most of its properties from the dominant partner, i.e., fungi.

Lichens usually can be spotted on the ground, on rocks and on the bark of trees. These grow in moist places and in a clean and pure environment.