Indicator plants which can be used to indicate atmospheric pollution by SO2 are [NCERT 1983; CPMT 1989, 94]
A) Lichens like Usnea
B) Grassland like Deschampsia
C) Moss like Sphagnum
D) Climbers like Cucurbita
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The answer to your question is A
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Hey!
Lichens like usnea
Hope this helps uh
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