Question

Why do not lichens occur in Delhi where as they commonly grow in Manali or Darjeeling ?

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Answer 1

they grow where the temperature is low

Answer 2

Lichens need moist and pollution free environment for their growth.

Moreover they are highly sensitive to Sulphur dioxide.

Delhi has lakhs of automobiles which a meeting huge amount of Sulphur dioxide in atmosphere.

In such a highly polluted environment legends cannot grow while in Manali and Darjeeling the environment remains moist throughout the year and is relatively free from Sulphur Dioxide only two lesson number of automobiles.

This provides favourable conditions for the growth of Lichens.