Question :
Which one of the following is an indicator of air pollution?
Option 1:
Cycas
Option 2:
Algae
Option 3: Bryophytes
Option 4: Lichens
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Correct Answer: Lichens
Solution : The correct option is - Lichens
Rocks, trees, arid earth, metal, and concrete are just a few examples of the natural and man-made habitats where lichens can be found. Since they depend entirely on the atmosphere for their nutrients, they are significant as indicator species as they are sensitive to air pollution.
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