Proposal of cell theory was given by Henri Dutrochet .Cell theory Firstly
proposed by Mathias Jacob Schleiden and Theodor Schwann.
Rudolf Virchow observed that the new cells developed by the division of
pre- existing cells i.e. "Omnis Cellula e-cellula ".This is called the
theory of cell lineage or theory of common ancestry. This theory gives the
final shape to the cell theory. Soon Hackle established that the nucleus
stores and transmit traits.
Postulates Of Cell Theory
i. All living organisms are composed of cells and their
products.
ii. Each cell is made of a small mass of protoplasm containing a nucleus in
its inside and a plasma membrane with or without cell wall.
iii. All cells are basically alike in their chemistry and
physiology.
iv. Activities of an organism are the sum total of activities and
interactions of its constituent cells.
v. The cells evolve from pre-existing cells through divisions. vi. The cell
is the basic, structural and fundamental unit of life.
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