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Railways PYQCBT 1 2020

RRB NTPC · Question 11

Lichen is an organism which monitors

  1. gas pollution

  2. water pollution

  3. soil pollution

  4. air pollution

Show answer & explanation

Answer: (D) air pollution

Explanation

Lichens are very sensitive to sulphur dioxide and other air pollutants, so they are used as indicators of air pollution.