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THE CELL

CONTENT

  1. The Cell as a Living Unit of an Organism
  2. Forms in Which Cells Exist
  3. The Structure and Functions of the Cell
  4. Cell Theory
  5. Differences and Similarities between Plant and Animal Cells

 

The Cell as a Living Unit of an Organism

The cell is defined as the simplest, the smallest and basic unit of life. It is the structural and functional unit of a living organism. The cell can carry out all life activities such as feeding, respiration, movement etc.

Classification of Living Things Based on The Number of Cells

All living things are classified into two major groups depending on the number of cells they possess. These groups are:

  1. Unicellular or Acellular organism: Organisms which consist of only one cell e.g. Amoeba, Paramecium, Chlamydomonas and Euglena.
  2. Multicellular Organisms: Organisms which consist of two or more cells, e.g. Hydra, Flowering plants, Fish, Bird, Man etc.

Forms in Which Cells Exist

Living cells exist basically in four forms;

1.

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