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Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET PDF Download

The world is an interesting place and earth is considered home to 8.7 million species. Wouldn’t it be interesting to know the types of species of plants and animals with the help of well devised  systems. Thus, EduRev is providing effectively planned notes of “Taxonomy” under which you will study about identification, nomenclature and classification of the species.

What is Taxonomy?

Taxonomy is a science that deals with the naming, describing, and classification of all living organisms according to their similarities and differences .

Example: Plants, Animals

  • The word “Taxonomy” is derived from a Greek word – “taxis”, meaning arrangement or division, and “nomos”, meaning method.

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

  • Taxonomy deals with Characterization, Identification, and Classification. It helps us understand the diversity of life on Earth and how different organisms are related to each other.
  • The process of taxonomy is based on description, genetic variation, recognition and defining taxa in the ecosystem.
  • Carolus Linnaeus is considered the Father of Taxonomy. He is the one who developed the procedure to name and organize species. Even today this procedure is being followed. 

Question for Taxonomy: Identification, Nomenclature & Classification
Try yourself:Which of the following does deal with the study of Taxonomy.
View Solution

His contributions to taxonomy were:

(i) Hierarchical Classification System

(ii) Binomial nomenclature system

History of Taxonomy

Carolus Linnaeus [1707 - 1778]

  • He is known as the Father of Taxonomy, Father of Plant Taxonomy, and Father of Animal Taxonomy
  • Linnaeus gave the Two kingdom system classification. He grouped plants and animals into kingdom Plantae and kingdom Animalia, respectively. 
  • Linnaeus wrote many books. The most important publication is Systema Naturae.

To learn more about the History of the Taxonomy, Watch this video:  Introduction to Taxonomy 

Taxonomy includes the study of the following:

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

  1. Identification: Identification of living organisms.
  2. Nomenclature: Naming of living organisms.
  3. Classification: Classification of living organisms in groups.

1. Identification

  • Identification is the recognition of the essential character of an organism.
  • The procedure of nomenclature or naming is only possible if the organism is properly characterised and we know what organism the name refers to.

2. Nomenclature 

  • There are millions of plants and animals in the world; we know the plants and animals in our own area by their local names.
  • Even within a country, these regional names might differ from place to place and create confusion while communicating.
  • As a result, it is necessary to standardise the naming of living organisms so that they are known by the same name all over the world. This is referred to as Nomenclature.

These names represent a particular organism in every part of the world. The scientific names must be: 

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

Question for Taxonomy: Identification, Nomenclature & Classification
Try yourself:Who is known as the Father of Taxonomy?
View Solution

To accomplish the uniformity, certain international codes have been established:

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

3. Classification

  • The process of categorising things based on their characteristics is known as classification
  • When organisms share similarities, they are grouped together. 
  • Kingdom, phylum, class, order, family, genus, and species are the seven levels of classification for living organisms.

Additional information

Taxonomy is divided into two categoriesTaxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

1. Classical Taxonomy 

  • Classical taxonomy is based on recognizable morphological characters of normal individuals assumed to be the same appearance while their differences are inexpressible.
  • Classical taxonomy originated with Plato followed by Aristotle (Father of Zoology). Theophrastus (Father of Botany) up to Linnaeus (Father of Taxonomy) and his contemporaries.

Features of Classical taxonomy:

(i) Species are specified on the basis of morphological characters.

(ii) Only few characters are studied for classification.

(iii) It does not include the evolutionary relationship of organisms.

(iv) A few individuals or their preserved specimens are used for the study. This study is known as the typological concept.

(v) Species are believed to be static or unchanging. 

(vi) Species is the centre stage of the study, its sub-units are not important.

2. New Systematics or Modern Taxonomy

  • The term new systematics was coined by Julian Huxley (1940). 
  • New systematics is the study that takes into consideration of all types of characters including characters from classical morphology and anatomy such as:
    • Cytology (study of cells)
    • Physiology (functioning of living organisms)
    • Biochemistry (study chemical reactions at a molecular level)
    • Ecology (interaction of organisms with environment )
    • Genetics (study of genes and heredity)
    • Embryology ( formation and development of an embryo and fetus )
    • Behaviour etc, of the whole population instead of a few typological specimens.

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

  • In contrast to classical systematics, New Systematics strives to bring out evolutionary relationships amongst organisms. It also called population systematics and biosystematics.
  • In Modern taxonomy, large number of individuals are studied.

Features of Modern Taxonomy:

(a) New systematics is based on the study of all types of variations in the species.

(b) Modern taxonomy deals with the study of genetic constituents, cellular structure, phylogenetic relationship, mode of nutrition, reproduction along with morphological characters.

(c) Specifying boundaries of species is carried out on the basis of all types of biological traits. It is also called biological delimitation of species.

(d) Inter-relationships are brought out between primary & advanced species.

(e) Species are considered dynamic.

Question for Taxonomy: Identification, Nomenclature & Classification
Try yourself:Which of the following is a feature of Modern Taxonomy?
View Solution

Contributions in taxonomy by Carolus Linneus:

I. Hierarchical Classification System

A system of classifying organisms into different hierarchical levels is known as hierarchical classification. It includes the sequence of categories from kingdom to species in decreasing or increasing order, and vice versa.

Hierarchical Classification SystemHierarchical Classification System

What is Systematics?

Systematics is a branch of biology that deals with classifying plants, animals, and other organisms into categories that can be named, remembered, compared, and studied.

  • It deals with the evolutionary relationships between organisms.
  • The study of only one organism of a group provides sufficient information about that group's remaining members.
  • Linnaeus proposed the term "Systematics".
  • It includes a description of the morphological characters of plants or living organisms.

Systematics in AnimalsSystematics in Animals

Basis of Systematic Study

Basis of Systematic StudyBasis of Systematic Study

  1. Characterization: The organism to be studied is described on the basis of its morphological and other characteristics.
  2. Identification: Based on characterization, the organism's identification is carried out to know whether it is similar to any known taxa group.
  3. Classification: The organism is now classified based on its resemblance to different taxa. It is possible that the organism may not resemble any known taxa or groups to accommodate that a new group or taxon is raised.
  4. Nomenclature: After placing the organism in various taxa, its correct name is determined. If the organism is new to systematics, it is given a new name based on nomenclature rules and conventions.

Difference between Taxonomy & Systematics

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

II. Binomial Nomenclature System

Binomial nomenclature is the system of providing distinct and appropriate names to organisms, each consisting of two words, first generic name {i.e., name of genus) and second specific epithet (i.e., name of species).

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

  • For example, the Scientific name of Mango is written as Mangifera indica.
    In this name, Mangifera represents the genus and indica is a particular species or specific epithet.

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

  • All scientific names for animals under binomial nomenclature were given by Linnaeus in the tenth edition of his book Systema Naturae (1758). 

Note: The information provided above about “Binomial Nomenclature” is important with respect to the NEET exam.

Question for Taxonomy: Identification, Nomenclature & Classification
Try yourself:Select the correctly written scientific name of Mango, which was first described by Carolus Linnaeus. 
View Solution

Rules of Binomial Nomenclature

The rules framed by Linnaeus and by the above codes are as follows:

  1. Each organism is given only one name consisting of two words, generic and specific epithet
  2. Both the words in a biological name, when handwritten, are separately underlined, or printed in italics to indicate their Latin origin.
  3. The generic name is written first. It is followed by a specific epithet and then the name of the discoverer in full or in abbreviation. 
  4. The specific epithet begins with a small letter.
  5. The scientific name is printed or written in italics. They are Latinised or derived from Latin irrespective of their origin.

Question for Taxonomy: Identification, Nomenclature & Classification
Try yourself:Which of the following is against the rules of ICBN?  
View Solution

Learn this topic in depth through this video: Detailed Overview: Taxonomy & Nomenclature

In this document you have learnt the following points:

  • Taxonomy is a science that deals with the naming, describing, and classification of all living organisms .
  • Taxonomy includes the study of Identification, Nomenclature & Classification.
  • Taxonomy is based on recognizable morphological characters of normal individuals whereas new taxonomy is the study that takes into consideration of all types of characters including characters from classical morphology and anatomy.
  • Systematics is the branch of study related to the identification, classification and nomenclature of organisms. It deals with the evolutionary relationships between organisms.
  • Rules of binomial nomenclature framed by Linnaeus.
  • Binomial nomenclature is the system of providing distinct and appropriate names to organisms, each consisting of two words, first generic name and second specific epithet.
  • For example, the Scientific name of Mango is written as Mangifera indica.

Previous Year Questions (PYQs) on this Topic Asked in NEET

Q1:  Which of the following is against the rules of ICBN?     [NEET 2019] 
(a) Handwritten scientific names should be underlined. 
(b) Every species should have a generic name and a specific epithet. 
(c) Scientific names are in Latin and should be italicized when printed. 
(d) Generic and specific names should be written starting with small letters.

Correct Answer is Option (d)
According to the international code for botanical nomenclature (ICBN), the first word denoting the genus starts with a capital letter while the specific epithet starts with a small letter.
Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

Q2: Select the correctly written scientific name of Mango, which was first described by Carolus Linnaeus.     [NEET 2019]

(a) Mangifera Indica

(b) Mangifera Indica Car. Linn

(c) Mangifera indica Linn

(d) None

Correct Answer is Option (c)

  • According to Binomial Nomenclature, the first word denoting the genus starts with a capital letter while the specific epithet starts with a small letter
    Example: Scientific name of mango is Mangifera indica.
  • The author's name appears after the specific epithet, i.e., at the end of the biological name, and is written in an abbreviated form.
    Example: Mangifera indica Linn. which indicates this species was first described by Linnaeus.

Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET

Q3: Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature?     [NEET 2016]

(a) Biological names can be written in any language.

(b) The first word in a biological name represents the genus name, and the second is a specific epithet.

(c) The names are written in Latin and are italicized when printed.

(d) When written by hand, the names are to be underlined.

Correct Answer is Option (a)

Binomial nomenclature (also known as binary nomenclature) is a formal system for naming living things that consists of two parts (Genus & Species), both of which should be written in Latin grammatical forms.

Example: Homo sapiensExample: Homo sapiens

The document Taxonomy: Identification, Nomenclature & Classification | Biology Class 11 - NEET is a part of the NEET Course Biology Class 11.
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FAQs on Taxonomy: Identification, Nomenclature & Classification - Biology Class 11 - NEET

1. What is the definition of taxonomy in biology?
Ans.Taxonomy is the science of classification of living organisms. It involves the identification, naming (nomenclature), and categorization of organisms into hierarchical groups based on shared characteristics and evolutionary relationships.
2. What is the hierarchical classification system in taxonomy?
Ans.The hierarchical classification system in taxonomy organizes living organisms into a ranked structure that includes several levels: Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species. Each level represents a rank in the classification, with 'Domain' being the highest and 'Species' the lowest.
3. What are the rules of binomial nomenclature?
Ans.The rules of binomial nomenclature include: 1) The scientific name of an organism consists of two parts: the genus name (capitalized) and the species name (lowercase). 2) Both names are italicized or underlined. 3) The genus name can be abbreviated after its first use. 4) The name should be universally accepted and used to avoid confusion.
4. How does binomial nomenclature help in the classification of organisms?
Ans.Binomial nomenclature provides a standardized system for naming species, which helps in clear communication among scientists globally. It reduces confusion caused by common names, as each species has a unique, universally accepted scientific name that reflects its genus and species.
5. Why is taxonomy important in the field of biology?
Ans.Taxonomy is crucial in biology because it helps scientists identify and classify organisms, understand their relationships and evolution, and communicate effectively about biodiversity. It also plays a significant role in fields such as ecology, conservation, and medicine by providing a framework for studying organisms and their interactions.
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