Aristotle World School
Biology
Cell theory project
• Submitted To : Ms .Sonika Chauhan
• Submitted By : Apoorvi Yadav, Sakshi Verma

Cell : The unit of life
 The cell is the smallest, basic structural, and functional unit of living things.
 hence it is generally referred to as ‘building blocks of life.
 Cells are capable of independent existence and performing essential functions
of life.
 All organisms including plants and animals are made up of one or more cells
and all that cells come from pre-existing cells.
 Robert Hooke was the scientist who first discovered cells in a piece of cork.
 The living cells were first discovered by Antony Van Leeuwenhoek.

Development of Cell
Theory
• 1838-English Botanist, Matthias Schleiden, concluded that all
plant parts are made of cells.
• 1839- German physiologist, Theodor Schwann, who was a close
friend of Schleiden, stated that all animal tissues are composed
of cells.

Development of Cell Theory
 1858- Rudolf Virchow, Russian physician, after extensive study of
cellular pathology, concluded that cells must arise from preexisting
cells.

Cell theory
 All living things are made of cells.
 Cells are the basic unit of structure and function in an
organism(basic unit of life).
 Cells come from the reproduction of existing cells (cell division).