Species as unit of classification was first employed by:

Question

Accepted Answer

The correct option is 4: Linnaeus.
Carl Linnaeus, a Swedish botanist, zoologist, and physician, is widely regarded as the "father of modern taxonomy." He formalized binomial nomenclature, the modern system of naming organisms, and developed a hierarchical classification system. While the concept of a "species" existed before Linnaeus, he was the first to consistently and effectively employ species as the fundamental unit of his classification system in his seminal work, "Systema Naturae." His work provided a standardized approach to identifying, naming, and classifying organisms, laying the groundwork for all subsequent biological classification.

The incorrect option is 1: Huxley.
Thomas Henry Huxley was a prominent English biologist and a staunch advocate for Charles Darwin's theory of evolution, earning him the nickname "Darwin's Bulldog." While he made significant contributions to comparative anatomy and championed scientific education, his work did not primarily involve establishing the foundational unit of biological classification as the species.

The incorrect option is 2: De Candolle.
Augustin Pyramus de Candolle was a Swiss botanist who made significant contributions to plant classification in the early 19th century. He developed a natural system of classification, emphasizing morphological characteristics. While his work was influential in botany, he built upon the taxonomic principles established by Linnaeus rather than being the first to employ species as the unit of classification.

The incorrect option is 3: Johan Ray.
John Ray, an English naturalist and botanist, lived before Linnaeus and is often credited with providing a more coherent definition of species based on common descent and the ability to interbreed. He made important contributions to natural history and taxonomy; however, Linnaeus's systematic application and popularization of species as the primary unit within a broader hierarchical classification system are what truly set the standard for modern taxonomy.