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Organization of Cell

  • Cell
    • Cells are the basic structural units and the building blocks of all living organisms.
  • Discovery of the Cell

  • Cell was discovered by Robert Hooke in 1665 after observing a piece of cork under a magnifying device.

  • Robert Hooke coined the term “cell”.

  1. Schleiden and Schwann proposed the cell theory. According to cell theory-

    Cells are the basic structural and functional units of life.

    All living organisms are made up of one or more cells.

    New cells arise from pre-existing cells.

  • Number of Cells

  • Organisms made of only a single cell are called unicellular organisms.

  • For example: Amoeba and Paramecium

  • Single cell in these organisms performs all the basic functions such as digestion, respiration, excretion, etc.

  • Organisms made up of more than one cells are called multicellular organisms.

  • For example: Humans, cow, …

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