How can lichens be used as industrial pollution indicators?

How can lichens be used as industrial pollution indicators?
  1. They will not grow in areas that are polluted
  2. They will grow more vigorously in areas that are polluted
  3. They will change color in areas that are polluted
  4. They will produce a different smell in areas that are polluted

Solution

Lichens can be used as industrial pollution indicators because they will not grow in areas that are polluted.

Asked in: NCERT

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