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Question

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

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Solution

Lichens need moist and pollution free environment for their growth. Moreover, they are highly sensitive to sulphurdioxide (SO2) Delhi has lakhs of automobiles which emithuge amount of SO2 in atmosphere. In such a highly pollutedenvironment lichens cannot grow. While in Manali andDarjeeling the environment remains moist throughout theyear and is relatively free from SO2 owing to lesser numberof automobiles. This provides favourable conditions for the growth of lichens. Since, lichens are highly sensitive to SO2they act as bioindicator.

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