Multiple choice

Some reliable indicators of air pollutants (SO2 and noxious gages) are�

  1. Ferns and Cycas

  2. Green algae and aquatic liverworts

  3. Lichens and mosses

  4. Neem tree and eichhornia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lichens and mosses are sensitive to sulfur dioxide and other air pollutants, making them excellent bioindicators. Their presence or absence in an area reveals air quality levels. These organisms disappear from polluted areas and return when conditions improve, providing visible evidence of pollution.

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