Question

4. What are lichens ?​

Answer 1

Answer:

Lichens is a symbiotic relationship between different organisms - a fungus and an alga. They can grow on rocks, decaying wood logs, tree barks etc. Lichens are used to prepare natural indicator called litmus.

Explanation:

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Answer 2

Answer:

Lichens are made up of two tiny living things: a fungus and an alga. The fungus and the alga benefit from living together. The alga produces food, and the fungus gathers water. In this way a lichen can survive harsh weather that would kill a fungus or an alga growing alone. This type of relationship is called symbiosis.