Paper 1 · People, Development and Environment
Which of the following organisms is the main indicator of sulphur dioxide and nitrogen pollution?
ABlue green algae
BLichens ✓ Correct
CE. coli
DNone of the above
Correct answer: (B) Lichens — Lichens are the main indicator of sulphur dioxide and nitrogen pollution, so that is the answer.
Explanation
★Lichens are the main indicator of sulphur dioxide and nitrogen pollution, so that is the answer.
★Lichens are very sensitive to air quality.
★They cannot survive where sulphur dioxide and nitrogen pollution are high.
★So their presence or absence indicates such pollution.
★Blue green algae and E. coli are not used as air-pollution indicators here.
★So the answer is lichens.
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