Taxonomic entities are classified in three ways. They are artificial classification, natural classification and phylogenetic classification.

Classification by Attributes or Qualitative classification Classification according to attributes is of two kinds: simple classification and manifold classification.

In many cases, standards include a classification system such as a standard vocabulary and set of definitions that can be used to classify things….Standards.

1 : the act or process of classifying. 2a : systematic arrangement in groups or categories according to established criteria specifically : taxonomy. b : class, category. Other Words from classification Synonyms Example Sentences Learn More about classification.

Basis of Classification. Species is the basic unit of classification. Organisms that share many features in common and can breed with each other and produce fertile offspring are members of the same species. Related species are grouped into a genus (plural- genera).

The major levels of classification are: Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species.

Ranks. The goal of classifying is to place an organism into an already existing group or to create a new group for it, based on its resemblances to and differences from known forms. To this end, a hierarchy of categories is recognized.

Three importance of classification are: It helps in the identification of living organisms as well as in understanding the diversity of living organisms. To understand and study the features, similarities and differences between different living organisms and how they are grouped under different categories.

The advantages of classifying organisms are as follows: (i) Classification facilitates the identification of organisms. (ii) helps to establish the relationship among various groups of organisms. (iii) helps to study the phylogeny and evolutionary history of organisms.

Plants, Animals, Protists, Fungi, Archaebacteria, Eubacteria. How are organism placed into their kingdoms? You are probably quite familiar with the members of this kingdom as it contains all the plants that you have come to know – flowering plants, mosses, and ferns.

7 Major Levels of Classification There are seven major levels of classification: Kingdom, Phylum, Class, Order, Family, Genus, and Species. The two main kingdoms we think about are plants and animals. Scientists also list four other kingdoms including bacteria, archaebacteria, fungi, and protozoa.

Carolus Linnaeus

Ribosomal RNA is a molecular building block for ribosomes . Under this system, organisms are classified into three domains and six kingdoms . The domains are Archaea, Bacteria, and Eukarya. The kingdoms are Archaebacteria (ancient bacteria), Eubacteria (true bacteria), Protista, Fungi, Plantae, and Animalia.

Comparison of Classification Systems

According to this system, the tree of life consists of three domains: Archaea, Bacteria, and Eukarya. The first two are all prokaryotic microorganisms, or mostly single-celled organisms whose cells have no nucleus. All life that has a cell nucleus and eukaryotic membrane-bound organelles is included in Eukarya.

The Five Kingdoms of Life

• Kingdom Monera (Prokaryotic bacteria and blue green algae).
• Kingdom Protista (Unicellular Eukaryotic organisms- protozoans, fungi and algae).
• Kingdom Fungi (Multinucleate higher fungi).
• Kingdom Plantae (Multicellular green plants and advanced algae).
• Kingdom Animalia (Multicellular animals).

On what basis are the living organisms divided in the five-kingdom classification? The living organisms are divided into five different kingdoms – Protista, Fungi, Plantae, Animalia, and Monera on the basis of their characteristics such as cell structure, mode of nutrition, mode of reproduction and body organization.

The five kingdoms are:

• animals (all multicellular animals)
• plants (all green plants)
• fungi (moulds, mushrooms, yeast)
• protists (Amoeba, Chlorella and Plasmodium)
• prokaryotes (bacteria, blue-green algae)

Whittaker’s classification scheme recognizes five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia. 6 Kingdoms? Based on RNA studies Carl Woese divided the prokaryotes (Kingdom Monera) into two kingdoms, called Eubacteria and Archaebacteria. The Eubacteria and Archaebacteria made up the other two urkingdoms.

The Six Kingdoms of Life Organisms are placed into these categories based on similarities or common characteristics. Some of the characteristics that are used to determine placement are cell type, nutrient acquisition, and reproduction. The two main cell types are prokaryotic and eukaryotic cells.

The six kingdoms are:Animal, Plant, Protist, Fungi, Bacteria, Archaea . Bacteria is both a domain and a kingdom. Archaea is also both a domain and a kingdom. Within the Eukarya domain, there are four more kingdoms: Animal, Plant, Fungi, and Protist.

Carl Woese

Five kingdoms

Thomas Cavalier-Smith

Whittaker