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Lichens indicate SO2 pollution because they

A. show association between algae and fungi.

B. grow faster than others.

C. are sensitive to SO2.

D. flourish in SO2 rich environment.

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Correct Answer : C.


Lichens are formed by symbiotic relationship between algae or cyanobacteria and fungi. Lichens typically grow in harsh environments in nature, most lichens, especially epiphytic fruticose species and those containing cyanobacteria, are sensitive to manufactured pollutants. Hence, they have been widely used as SO2 pollution indicator organisms.

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