This page features NEET Questions from the topicLiving World Diversity in the Living World Quiz 3/5 from the lesson The living world.


Biologists across the world follow a set of universally accepted rules to assign scientific names to organisms. These rules ensure that every known species has one valid name that is recognised globally. The system used today is called binomial nomenclature, where each organism is given a name consisting of two parts: the generic name (genus) and the specific epithet (species). This elegant naming method was formalised by Carolus Linnaeus in the 18th century and has since become the foundation of modern biological classification.

To understand this clearly, consider the scientific name of the mango: Mangifera indica. Here, Mangifera denotes the genus to which the plant belongs, and indica is the specific epithet distinguishing this particular species from others within the genus. This two-word naming system is preferred because it is concise, uniform, and avoids the confusion created by varying local or vernacular names.


Key points from the paragraph:

Scientific names are always in Latin or Latinised form, regardless of the organism’s native region. Latin is a “dead language,” meaning it does not change with time, ensuring stability.
The first word represents the genus and begins with a capital letter, while the specific epithet begins with a small letter.
Scientific names must be italicised when printed. When handwritten, both parts must be separately underlined to indicate their Latin origin.
The name of the person who first validly published the species description—called the author citation—is written after the species epithet. For example, Mangifera indica Linn. shows that Linnaeus was the first to describe and name the species.



These rules form the core of international naming systems such as the ICZN (International Code of Zoological Nomenclature) for animals and the ICN (International Code of Nomenclature for algae, fungi, and plants). Together, these codes ensure global uniformity, priority, and accuracy in naming species and guarantee that each species has only one recognised, valid name.

Additional scientifically-validated information (with competitive exam relevance):

Modern taxonomy emphasises typification, where each species name is linked to a physical reference specimen called a type specimen stored in a herbarium or museum. This prevents ambiguity in future identifications.
Research in integrative taxonomy—combining morphology, molecular markers, phylogeny, and biogeography—is significantly improving species identification and reducing misclassification. Reviews in journals such as Systematic Biology and Cladistics highlight how DNA barcoding (e.g., COI gene for animals, rbcL/matK for plants) provides objective evidence for species delineation.
A global-scale analysis published in Proceedings of the National Academy of Sciences (PNAS) emphasises that more than 80% of Earth’s species are yet to be described, making accurate nomenclature essential for conservation biology, ecological research, and climate-change modelling.
Correct use of binomial nomenclature is frequently tested in competitive exams such as NEET, CSIR-NET, ICAR-AIEEA, and state-level entrance tests. Students should remember common pitfalls:

The genus name cannot be abbreviated in first use.
Species names never carry capital letters.
Author names are not italicised.
Scientific names must follow the principle of priority—the earliest validly published name takes precedence.
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This page features NEET Questions from the topic Living World Diversity in the Living World Quiz 3 from the lesson The living world.
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