Question

Which of the following is/are sources of litmus?
(A) Roccella montagnei
(B) Dendrographa leucophaea
(C) E. coli
(D) Amoeba

Answer 1

Hint :Litmus is a water-soluble mixture of various lichen-derived dyes. In acidic solutions, the litmus indicator solution turns red, and in alkaline solutions, it turns blue. In neutral solutions, it turns purple. Litmus paper, which comes in two colours: red and blue, is typically more durable.

Complete Step By Step Answer:
Litmus is a water-soluble mixture of various lichen-derived dyes. It is often absorbed onto filter paper to create one of the earliest types of pH indicator, which is used to measure the acidity of materials.
In acidic solutions, the litmus indicator solution turns red, and in alkaline solutions, it turns blue. In neutral solutions, it turns purple. Litmus paper, which comes in two colours: red and blue, is typically more durable.
Litmus paper is a pH indicator that can be used to determine if a solution is acidic or basic. Litmus can be found in a variety of lichen species, with Roccella montagnei and Dendrographa leucophaea being the most common.
Litmus can be found in a variety of lichen habitats. Roccella tinctoria (South America), Roccella fuciformis (Angola and Madagascar), Roccella pygmaea (Algeria), Roccella phycopsis, Lecanora tartarea (Norway, Sweden), Variolaria dealbata, Ochrolechia parella, Parmotrema tinctorum, and Parmelia are some of the organisms used to make the dyes. Roccella montagnei (Mozambique) and Dendrograma leucophaea are the major sources at the moment (California).
Hence, option A and B are correct.

Note :
Litmus paper is a pH indicator that can be used to determine if a solution is acidic or basic. Litmus can be found in a variety of lichen species, with Roccella montagnei and Dendrographa leucophaea being the most common.