Lichens are composite organisms consisting of a symbiotic association between a fungus and an alga or cyanobacterium. Litmus is extracted primarily from species like Roccella tinctoria and Lecanora tartarea.
Litmus - the acid base indicator is obtained from
Asked in UPPSC Upper Mains 2010 · Topic: Taxonomy (Taxonomic Characters and Evidence (Morphological, Anatomical, Cytological, Molecular))
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