Which of the following is the best indicators of sulphur dioxide pollution ?

Pinus

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Ferns

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Algae

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Lichens

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Solution

The correct option is D
Lichens

Lichens are very sensitive to sulphur dioxide pollution in the air. Since industrialization, many lichen species have become extinct in large areas. Lichens are widely used as environmental indicators or bio-indicators. If air is very badly polluted with sulphur dioxide there may be no lichens present, just green algae may be found.

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A.	Viroids	Infectious free RNA	Potato spindle tuber disease
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C.	Viruses	Nucleo proteins	Mumps
D.	Lichens	Algae + Fungi	Indicators of CO pollution

Question 26
Growth of Lichens on barren rocks is followed by the growth of:

(a) moss
(b) ferns
(c) gymnosperms
(d) algae

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