Which one of the following living organisms gives litmus ?

[amp_mcq option1=”Protozoa” option2=”Virus” option3=”Lichen” option4=”Saccharomyces” correct=”option3″]

This question was previously asked in

UPSC CDS-1 – 2022

Litmus, a natural indicator used to test the acidity or alkalinity of substances, is extracted from lichens.

Lichens are composite organisms formed by the symbiotic association between a fungus and an alga or cyanobacterium. Specific species of lichens, particularly from the genus *Rocella* and *Leconora*, are processed to produce litmus dye.

Protozoa are single-celled eukaryotic organisms. Viruses are non-cellular infectious agents. Saccharomyces is a genus of yeast, which are fungi. None of these are the source of litmus. Litmus turns red in acidic solutions and blue in basic solutions.

More similar MCQ questions for Exam preparation:-