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Option 4 : Schleiden and Schwann

The correct answer is Schleiden and Schwann.

  • Schleiden and Schwann presented the cell theory that all plants and animals are composed of cells and that the cell is the basic unit of life.

  • Cell theory was first developed in 1839 by Matthias Jakob Schleiden and Theodor Schwann.
  • There are three observations of cell theory:
    • All organisms are made of cells.
    • Cells are the basic units of life.
    • Cells arise from pre-existing cells.
  • The third part was described by Rudolf Virchow in 1858.

  • Robert Hooke
    • He was the first to visualize a micro-organism.​
    • He discovered Cell in 1665.
  • Virchow
    • ​Rudolf Virchow is known as the father of modern pathology.
    •  He is the founder of social medicine.
    • He added the third statement in the cell theory.
  • Robert Brown
    • ​He was a Scottish botanist.
    • He is known for one of the earliest detailed descriptions of the cell nucleus.
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