A) bacteria
B) fungi
C) algae
D) lichen
Correct Answer: D
Solution :
Litmus is obtained from lichen spp. like Roccellatinctoria, Roccellamontagnei and Lasalliapustulata. Inferior kinds of litmus is obtained from species of Parmelia, Variolania and Lecanora etc. Litmus is used as acid-base indicator. Acid impart a red colour to blue litmus and alkalis cause reddened litmus to return its original blue colour.
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