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Question

Which one of the following lichen genera is used as laxative?

A
Usnea
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B
Parmelia
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C
Cetraria
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D
Cladonia
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Solution

The correct option is C Cetraria

Certaria is a kind of lichen which lives in close association with green algae. It is a very good source of laxative which makes bowel movement easy and loosen the stools. Most of these species are found at high latitudes, occurring on sand and shrub lands.


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