Question

Why do lichen occur in delhi whereas they commonly grow in manali or darjaling

Answer 1

Answer:

lichens does not grow in polluted area. and hence they are also called pullution indicators

Answer 2

Answer:

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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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