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The cell theory, also known as the cell principle, is a fundamental concept in biology that states that all living organisms are composed of one or more cells, that cells are the basic unit of structure and function in living organisms, and that all cells arise from pre-existing cells. The cell theory was first proposed in the mid-17th century by Robert Hooke, who observed and described the cell walls of cork in his book "Micrographia". However, it was not until the 19th century that the cell theory was widely accepted and developed into its modern form by scientists such as Matthias Schleiden, Theodor Schwann, and Rudolf Virchow. Today, the cell theory forms the foundation of modern biology and is a fundamental concept in the study of life and living organisms.
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Cell
It is the structural and functional unit of life.
→ Cell is termed as the structural unit of life as it provides structure to our body.
→ Cell is considered as the functional unit of life as all the functions of the body take place at cell level.
Discovery of cell:
→ Discovered by Robert Hooke in 1665.
→ Robert Brown in 1831 discovered the nucleus in the cell.
Cell Theory:
Cell theory states that:
→ All living organisms are composed of cells.
→ Cell is the fundamental unit of life.
→ All new cells come from pre-existing cells.
Types of Organisms on the Basis of Number of Cells
There are two kinds of organisms on the basis of cells:
(i) Unicellular Organisms: The organisms that are made up of single cell and may constitute a whole organism, are named as unicellular organisms.
Explanation:
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