Q.2 Why lichens do not occur in Delhi, where as they commonly grow in Manali or Darjeeling?
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Explanation:
Lichens are bioindicators of air pollution. ... Delhi has maximum air pollution due to a large number of vehicles compared to Manali and Darjeeling. Therefore, the growth of lichens does not occur in Delhi or any place, where air pollution is high.
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- Lichens are very sensitive to sulphur dioxide gas (SO2), which is released by burning of fossil fuels from automobiles. Delhi is highly polluted city due to number of vehicles running on the roads. Lichens cannot grow in such conditions. Manali and Darjeeling do not have much air pollution as compared to Delhi, so the lichens commonly grow in these places.
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