Question

Economic importance of lichen.

Answer 1

In return, fungus protects algae; provide water, nitrogen substance and mineral salts. - Lichen, especially crustaceous lichens erode rocks and convert them in to soil. ... It would not be wrong to say that the lichen is an organism with ecological and economic importance and is used in many forms.
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Answer 2

lichen live in association with other orgaisms in which both the partners mutually gain from each other. This plant is a kind of association is called symbiosis