Question

Why do not lichens occur in delhi whereas they commonly grow in manali or darjeeling

Answer 1

Answer:due to climatic conditions and also the varieties of plants available...

Explanation:

As lichens are parasitic and they r in the term symbiotic relationship so they want particular plants which give them safe and secure shelter so such plants r not found in places like Delhi ......

Hence they r not familiar in Delhi

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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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