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Lichens can serve as pollution

$(a)Receptors\qquad(b)\;Indicators\qquad(c)\;Attackers\qquad(d)\;Controllers$

1 Answer

Indicators
Lichens can be used as air pollution indicators, especially of the concentration of sulphur dioxide in the atmosphere.
Hence (b) is the correct answer.
answered Jan 20, 2014 by sreemathi.v
edited Nov 22, 2017 by sharmaaparna1
 
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