Taxonomical Hierarchy

The word taxonomy means an arrangement. It is the science for arranging living organisms according to the characteristics they share. The word hierarchy means an arrangement of list of things in an above, below or same level. Taxonomical hierarchy is the part of biological science in which plants, animals, micro organisms etc. are sequentially arranged in descending order during the classification of organism. A Swedish scientist Carolues Linnaeus is called the father of taxonomy because he was the first to observe and categorize the living organism into different category and applied binomial nomenclature for them. He used only five categories first-class, order, genus, species and variety. Then the last one was discarded and three were added- kingdom, division, and phylum.

Taxonomical hierarchy is consist of eight major taxonomic ranks-domain, kingdom, phylum, class, order, family, genus, species. Each rank is consist of subgroups and super groups according to the requirements of taxonomical hierarchy.

Taxon: It is any level of grouping of organisms. e. g. Mammals, roses, reptiles etc.

Species: It is a natural population or group of natural populations of individuals that are genetically distinct and reproductively isolated with similar essential morphological traits. It is also genetically closed system because member do not interbreed with members of other species. It is the basic of taxonomic hierarchy. At times, hybridization occurs between two different species. Interbreeding cannot be applied for delimitation of species in case of prokaryotes’ and some species which lack sexual reproduction. In this case morphological characteristics are used.

Genus: It is an assembly of related species which evolved from some n ancestors, having common characters called correlated characters. Genus are either monotype or polytope.

Family: A group of related genera with certain similar characters.

Order: A group of related families with some common features.

Class: Organisms made of one or more related order. It ends with suffix -phyceae, opsida, ae but in case of animals it differs.

Phylum:  All organisms belonging to various classes having a few common characters. In this division the given suffix -phyceae and the subdivision -phytina.

Kingdom: All organisms that shares some common characters. It is the highest rank of taxonomic hierarchy. E.g. kingdom -Animalia, kingdom planta.

Species and genus form together binomial nomenclature. Suppose binomial nomenclature of man is Homo sapiens. Here Homo is genus and sapiens is species. It is written in italics and when hand written it is underlined.


Importance of taxonomical hierarchy are: 

1. Categorize living organism easily.

2. Study the development, genetics, cytology, physiology, pathology and evolution of all living organism.

3. Study the characteristics, habits, affinities habitats of different organisms can be done by taxonomic hierarchy.

4. Easy to study the living organism of same species and their connections.

5. Food chains, food webs and biological control cannot be known without taxonomy.

6. All breeding programmes require the knowledge of different traits present in various varieties, subspecies and related species.

Domain-Living

Kingdom-Animalia

Phylum-chordate

Class-Mammalia

Order-Carnivore

Family-Felidae

Genus-Panthera

Species-tigris


Questions

1. Who is the father of taxonomic hierarchy?

Answers: Linnaeus is called the father of taxonomic hierarchy.


2. Define classification.

Answers: It is the method of grouping animals according to their similarities and differences.


3. why are scientific name preferred over common names?

Answers: It is used to avoid confusion of names as it occurs in case of common names used for a particular organism in a particular language.





From Taxonomical Hierarchy to HOME PAGE

New! Comments

Have your say about what you just read! Leave me a comment in the box below.


Recent Articles

  1. Respiratory Volumes and Capacities | Tidal Volume | Dead Space

    Aug 29, 25 05:17 PM

    Respiratory Volumes
    Explain respiratory volumes and capacities: Tidal Volume - Tidal volume is the volume of air inspired or expired in relaxed or resting position. Amount of tidal volume is about 500 m and it consists o…

    Read More

  2. Mechanism of Breathing | Definition of Inspiration and Expiration

    Aug 17, 25 11:41 PM

    Pressure in Lungs
    Breathing is the process which is accomplished in three states that is inspiration expiration and pause . Definition of inspiration - Entry of air into the lungs from outside during breathing is calle…

    Read More

  3. Human Respiratory System | External Nares | Nasal Cavity | Pharynx

    Aug 04, 25 03:14 PM

    Lungs
    Definition of respiration - This is the process of making energy available to organisms and their living cells through enzyme controlled catabolic breakdown of organic molecules. The organic materials…

    Read More

  4. Disorders of Digestive System | Symptoms of Jaundice | Vomiting |

    Jul 16, 25 12:18 PM

    Symptoms of Diarrhoea
    Jaundice- It is a disease that occurs due to Umesh discoloration of the skin due to deposition of bilirubin and biliverdin pigment. Jaundice can be offered according to the different position like pre…

    Read More

  5. Absorption of Digested Products | Absorption of Water | Nephrons

    Jul 09, 25 02:24 PM

    Villus
    Food and water is observed in different parts of the body and is distributed in different cells and tissues. Absorption of food is observed to be observed in the small intestine in the specific type o…

    Read More