WHAT IS CELL THEORY?

EMERGENCE OF CELL THEORY:

It is a fundamental theory about cell.In 1838 Schleiden, a German botanist, concluded that, despite differences in the structure of various tissues, plants were made of cells.In 1839, a German zoologist, T.Schwan, published a comprehensive report on the cellular basis of animals. Both of them proposed the cell theory.The important feature s of cell theory are:

• The body of all the living organisms are composed of one or more cells.

• Cell is the structural and functional unit of life. It is a 'de novo' structure i.e could arise from non-cellular materials.

A German pathologist Rudolf Virchow made a convincing case and added a third point to the cell theory which was the correction of the the statement that a cell is a 'de novo' structure.He proposed that cell can only be be arises by the division of a pre-existing cell, it is not a de novo structure.

Cell theory brought a great revolution in the field of biology which established that the function of an organism is the result of activities and interaction of the cell units. 

Schwann_Theodore

                                                  

Matthias_Jacob_Schleiden

WHAT IS A CELL?
CELL is the most puzzling 
mystery of nature about....