Who introduced the binomial system of nomenclature?

• A. Carolus Linnaeus
• B. Louis Pasteur
• C. Edward Jenner
• D. Robert Koch

Answer: (A)

Binomial nomenclature is the two-part naming system used for all organisms, combining a genus name with a species epithet to create a unique, universal label. This framework lets scientists across different languages communicate without ambiguity, using examples like Homo sapiens for humans or Escherichia coli for a common gut bacterium. Carolus Linnaeus introduced and formalized this approach in the 18th century, most clearly in Systema Naturae and later works, where he proposed the standardized Latin form, with the genus capitalized and the species epithet in lowercase, and the names often printed in italics. By applying this system to both plants and animals, Linnaeus created a coherent method that replaced long descriptive phrases with concise, stable names, enabling a consistent taxonomy. Figures like Louis Pasteur, Edward Jenner, and Robert Koch contributed foundational microbiology discoveries, such as vaccines and germ theory, but they did not introduce the binomial naming scheme.