The arrangement of cells in a specific passion to make an entire living organism is called Cellular organization. Cellular organization are of three types.

1) Unicellular Organization: In this type of organization an organism is composed of only one cell. Those type of organisms are called unicellular organisms. Examples: Amoeba, Paramecium, and Euglena, Bacteria, etc.

2. Colonial Organization: In colonial type of cellular organization, many unicellular organisms live together but do not have any division of labour among them. Each unicellular organism in a colony lives its own life and does not depend on other cells for its vital requirements. Volvox is a green alga found in water that shows colonial organization. Hundreds of Volvox cells make a colony.

3) Multicellular organization: In multicellular organization, cells are organized in the form of tissues, organs and organ systems. Frog and mustard are the familiar examples of multicellular organization.

Examples of Multicellular Organisms:

Mustard plant: Mustard plant (scientific name: Brassica campestris) is sown in winter and it produces seeds at the end of winter. The plant body is used as vegetable and its seeds are used for extracting oil. The organs of the body can be divided into two groups on the basis of their functions. Root, stem, branches and leaves are the vegetative organs, which do not take part in the sexual reproduction of the plant. Flowers are the reproductive parts of the plant because they take part in sexual reproduction and produce fruits and seeds.


  • Common name … Mustard
    KINGDOM … Plantae
    DIVISION … Tracheophyta
    CLASS … Dicotyledonae
    ORDER … Capparales
    FAMILY … Brassicaceae
    GENUS … Brassica
    SPECIES … Campestris
    SCIENTIFIC NAME … Brassica Campestris.

Frog: Frog (scientific name: Rana tigrina) shows the multicellular organization. The body is made of organ systems and each organ system consists of related organs. All the organs are made of specific tissues (epithelial, glandular, muscular, nervous etc). Some organs and organ systems of frog have been described in the practical activity given next.

Common name … Frog
KINGDOM … Animalia
PHYLUM … Chordata
CLASS … Amphibia
ORDER … Salientia (Anura)
FAMILY … Ranidae
SPECIES … Tigrina
SCIENTIFIC NAME … Rana tigrina.

Human Being:

2) Common name … Man
KINGDOM … Animalia
PHYLUM … Chordata
CLASS … Mammalia
ORDER … Primat
FAMILY … Hominidae
GENUS … Homo
SPECIES … Sapiens

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