What is lichen... ....
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Lichen is a dual organism which is made up of fungus and an alga , associated in a mutually beneficial association.
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Explanation:
A lichen is a peculiar combination of an alga and a fungus the two live deriving mutual benefits.
They are group of greyish green plants which grow on rocks, tree - trunks, dead wood, etc.
The algae manufactures food which becomes available to the fungus and, the absorbs and retains water and thus keeps the algal cells moist. A example of symbiosis.
They are most common in wetlands, rare in rivers and streams and are not found in ground water.
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