Browse Questions

Which of the following is best indicator of $SO_2$ pollution:-

$\begin{array}{1 1}(a)\;\text{Bryophyte}\\(b)\;\text{Pteridophytes}\\(c)\;\text{Lichen}\\(d)\;\text{Algae}\end{array}$

Best indicator of $SO_2$ pollution is lichen
Hence (c) is the correct answer.