CELLULAR ORGANIZATIONS
- All the organisms have been divided into five major groups i.e. prokaryotes, protists, fungi, plants and animals.
- All organisms are made of cells. There are two basic types of cells.
- The organisms in first group are made of prokaryotic cells while all other groups have eukaryotic cells. Cells organize in three ways to make the bodies of organisms.
- Cells make unicellular, colonials and multicellular organizations and the organisms formed through these organizations are unicellular organisms, colonial organisms and multicellular organisms.
UNICELLULAR ORGANISMS
- In unicellular organisms, only one cell makes the life of an organism. All the life activities are carried out by the only cell.
- Amoeba, Paramecium, and Euglena are Common examples.
COLONIAL TYPE
- 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 .
MULTICELLULR ORGANIZATION
- Multicellular organization, cells are organized in the form of tissues, organs and organ systems.
- Frog and mustard are the familiar examples of multicellular organization
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.
FROG
- Frog (scientific name: Rana tgrina) 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).
 BASIC TO HIGHER LEVEL){kind=link}
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