lichens do not occur in the Delhi whereas they commonly grow in Darjeeling jastify the statemant
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Because it need more humid place than delhi to be grown and it react with sulphur dioxide to form a poisonous compound that kills the plant so it need less sulphur dioxide polluted place to survive but delhi is extremely polluted by sulphur dioxide
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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.
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