Question

Lichens are not found in Delhi because of

Answer 1

lichens are pollution indicators. They do not grow in polluted areas.
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Answer 2

Lichens are also called the bio-indicators of the pollution. They are found only in the non-polluted areas. Lichens are highly susceptible towards sulphur dioxide. A compound in them reacts with sulphur dioxide to form a poisonous chemical that kills the plant itself. This is because lichens grow in areas where sulphur dioxide pollution is very less, e.g., in Manali and Darjeeling. Delhi is highly polluted place where lichens cannot grow and survive.


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