Which one of the following is best indicator of $S O_{2}$ pollution ?

Pinus

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Fem

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Lichen

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Algae

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Solution

The correct option is B Lichen
Lichens are the best indicator of environmental pollution mainly $S O_{2}$ . Lichen is a mutualistic association of algae and fungi. In areas of excessive $S O_{2}$ pollution, lichens cannot grow but only green algae may be seen, thus acting as an indicator for $S O_{2}$ .
Hence correct answer is option C.

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