Concept:Litmus is a water-soluble solution that can be used to determine whether a solution is acidic or basic.It indicates whether the solution is acidic or basic.Explanation:Litmus is found in many species of Lichens like Lecanora Tartarea and Roccella Tinctoria.The Netherlands is one of the world's leading producers of litmus paper.Crushing and grinding of lichens are done in the process of extracting litmus solution from them.Lichen is a multicellular organism originates from algae or cyanobacteria. The lichens aid in the preparation of the litmus solution.Uses of Litmus:Litmus is primarily used to determine whether a solution is acidic or basic.Under acidic conditions, blue litmus paper turns red.Under basic circumstances, red litmus paper turns blue.Water-soluble gases are also tested with wet litmus paper.Additional InformationProtozoa:Protozoa are microscopic unicellular eukaryotes with a complex internal structure and a wide range of metabolic functions.Virus:Virus is a small, simple infectious agent that can only multiply in living cells of animals, plants, or bacteria.Saccharomyces:It is also known as baker's yeast, which is a single-celled fungus used in the production of bread and other wheat-based products.