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The Living World - Binomial nomenclature

Grade 11CBSEBiology

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Binomial Nomenclature is the formal system of naming organisms, introduced by Carolus Linnaeus in his works like Species Plantarum\textit{Species Plantarum} and Systema Naturae\textit{Systema Naturae}.

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Every biological name consists of two components: the Generic name (denoting the Genus\textit{Genus}) and the Specific epithet (denoting the species\textit{species}).

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Biological names are generally in Latin or are Latinized. When printed, they are written in italics, and when handwritten, they are separately underlined to indicate their Latin origin.

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The first word (Genus) starts with a capital letter, while the specific epithet starts with a small letter, for example: Mangifera indica\textit{Mangifera indica}.

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The author's name appears after the specific epithet in an abbreviated form, such as in Mangifera indica L.\textit{Mangifera indica L.}, where L.L. denotes that the species was first described by Linnaeus.

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Nomenclature is governed by international codes: ICBNICBN (International Code for Botanical Nomenclature) for plants and ICZNICZN (International Code for Zoological Nomenclature) for animals.

📐Formulae

Scientific Name=Generic Name+Specific Epithet\text{Scientific Name} = \text{Generic Name} + \text{Specific Epithet}

Full Biological Name=Genus(Capitalized) species(Lowercase) Author(Abbreviated)\text{Full Biological Name} = \textit{Genus}_{(\text{Capitalized})} \ \textit{species}_{(\text{Lowercase})} \ \text{Author}_{(\text{Abbreviated})}

💡Examples

Problem 1:

Identify the correct representation of the scientific name for the common housefly according to the rules of Binomial Nomenclature.

Solution:

Musca domestica\textit{Musca domestica}

Explanation:

The genus Musca\textit{Musca} starts with a capital letter, the specific epithet domestica\textit{domestica} starts with a small letter, and both words are italicized.

Problem 2:

Given the name Panthera leo L.\textit{Panthera leo L.}, identify the components.

Solution:

Genus: Panthera\textit{Panthera}, Specific Epithet: leo\textit{leo}, Author: L. (Linnaeus)L. \text{ (Linnaeus)}.

Explanation:

The first term is the genus, the second is the specific epithet, and the third is the abbreviated name of the scientist who first validly published the name.

Problem 3:

Why is the name Homo‾\underline{Homo} sapiens‾\underline{sapiens} underlined in handwritten notes?

Solution:

To indicate its Latin origin.

Explanation:

According to the rules of nomenclature, scientific names must be underlined separately when handwritten to signify that the name is derived from Latin, as Latin is a dead language and provides a fixed standard.