Question

give a general account on lichens (5m)
guys pls help me with this detail answer it'll be useful if you send me the key words.
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Answer 1

Answer:

Lichen is an organism that is formed by the symbiotic association of a fungus and an alga or cyano bacterium and occurs as crusty patches or bushy growths on tree trunks, bare ground, etc. . The fungus surrounds the algal cells, often enclosing them within complex fungal tissues unique to lichen associations