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The cell is a fundamental structural and functional unit of living organisms. Living organism are distinct in form, structure, behavior, heridity and development. Cells within a single plant or animal vary widely in structure and function, they all represent units of living material and have important properties in common. New cell arise from pre-existing cells and a zygote has ability to form the whole individual. Thus physiology and function of an organism is governed by the sum total of activities and interactions of its constituent cells.
Living being is formed by small units which are called as cells. Each cell is complete in itself. In unicellular organisms they function freely the different and various activities but in multicellular organisms they control the activities combinable. Each cell has a cell membrane which covers its protoplasm. This protoplasm. However in plant cells fungi bacteria the cell is also surrounded by a cell wall. Protoplasm is the site of living activities of every cell.
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