Why are lichens growing on tree trunks and rocks thought to be a sign of clean air? How do the two partners in a lichen help each other?

Question

TextSymbiotic Relationships in Lichens

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In a lichen, the alga and the fungus live together. Which statement correctly gives what each partner provides?

Assertion (A): Lichens are an example of a symbiotic relationship. Reason (R): In a lichen, the fungus makes food for the alga by photosynthesis.