Some reliable indicators of air pollutants (SO2 and noxious gases) are:
Correct answer: B. Lichens and mosses
- A. Ferns and Cycas
- B. Lichens and mosses
- C. Green algae and aquatic liverworts
- D. Neem' tree and Eichhornia
Explanation
Lichens and mosses absorb substances directly from the atmosphere and lack protective structures that would prevent pollutant accumulation, making them useful bioindicators of SO2 and other gases. Ferns, Cycas, and aquatic plants are not generally as reliable for this purpose.
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