Which of the following is/are sources of litmus?

Roccella montagnei

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Dendrographa leucophaea

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E. coli

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Amoeba

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Solution

The correct options are
A Roccella montagnei
B Dendrographa leucophaea
Litmus paper is used as a pH indicator to test a solution whether it is acidic or basic in nature. Litmus is found in different species of lichens like Roccella montagnei, Dendrographa leucophaea being the main sources.

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