A cell may be defined by the following ways:
(1) A cell is the structural and functional unit of life
(2) The self-reproducing, structural and functional unit matter of protoplasm which is surrounded by a living membrane is known as a cell.
Fig: A Cell
Types of Cells
On the basis of the presence or absence of the distinct nucleus, the cell is of two types.
(i) Prokaryotic Cell and
(ii) Eukaryotic Cell
Fig: A eukaryotic cell (left) and prokaryotic cell (right)
On the basis of physiological activities and the process of division, the cell can be divided into two types, such as-
(i)Somatic cell and
ii) Reproductive cell or gamete.
