Which of the following is the most suitable indicator of $S O_{2}$ pollution in the environment?

Lichens

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Conifers

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Algae

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Fungi

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Solution

The correct option is A Lichens
Lichens are the symbiotic association occurring between fungi and algae. These are sensitive to SO $_{2}$ and thus they cannot live in a surrounding containing it. Hence, they act indicator for SO $_{2}$ pollution in the environment.
So, the correct answer is option A, lichens.

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