$S O_{2}$ pollution is indicated by destruction of.

Climbers

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Lichens

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Mosses

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Grasses

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Solution

The correct option is C Lichens
Lichens are sensitive to the levels of SO $_{2}$ in the atmosphere.
The sulphurous and sulphuric acid compounds affect the lichen growth.
The lichens are sensitive to low pH and hence die off the trees, boulders and cliffs indicating SO $_{2}$ pollution.
So, the correct option is 'Lichens'.

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