Class 11 Biology Cell : The Unit of Life Cell theory

Cell theory

  • Schleiden and Schwann together formulated the cell theory.
  • Rudolf Virchow (1855) first explained that cells divided and new cells are formed from pre-existing cells.
  • Cell theory states that
  • All living organisms are composed of cells and products of cells.
  • All cells arise from pre-existing cells.


Fig. All cells arise from pre-existing cells

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