Cell theory was given by (a) Schleiden and Schwann (b) Virchow (c) Hooke (d) Haeckel

(a) Schleiden and Schwann

Cell theory was expanded by Virchow in 1855 by suggesting that all cells arise from pre-existing cells All animals and plants are composed of cells, which serve as the units of structure and function and all cell arise from pre-existing cells. This is called the Cell Theory. It was propounded by Matthias Schleiden and Theodor Schwann in 1839 later on Rudolf Virchow added to this in 1858.

  1. All organisms are made up of cells.
  2. New cells are formed from preexisting cells
  3. All cells are similar. Finally, cells are the most basic units of life.
  4. Cells provide the basic units of functionality and structure in living things.

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