M.J. Schleiden and Theodar Schwann proposed “The cell theory”. They prepared it in 1838 – 39.
Statements of modern form of cell theory :
1. All the living organisms are made up of cells and their products.
2. All the cells are formed from pre-existing cells.
3. All the cells are made up of similar chemicals and show similar metabolic activities.
4. Functioning of an organism depends on the functions carried out and the interaction of different cells present in the organism.
