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  • Our Natural Resources - 1 (Class IX)
  • Which of the following group of organism is a biological ...
Multiple choice

Which of the following group of organism is a biological indicator of air pollution?

  1. Green algae

  2. Azolla

  3. Eichornia

  4. Salvinia

  5. Lichens

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Lichens are a biological indicator of air pollution.

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