Question

Who has given cell theory? What are its main postulates?

Answer 1

In biology, cell theory is the historic scientific theory, now universally accepted, that living organisms are made up of cells, that they are the basic structural/organizational unit of all organisms, and that all cells come from pre-existing cells. Cells are the basic unit of structure in all organisms and also the basic unit of reproduction. With continual improvements made to microscopes over time, magnification technology advanced enough to discover cells in the 17th century. This discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, many debates about cells began amongst scientists. Most of these debates involved the nature of cellular regeneration, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1839. This is usually credited to Matthias Schleiden and Theodor Schwann. However, many other scientists like Rudolf Virchowcontributed to the theory. It was an important step in the movement away from spontaneous generation.

The three tenets to the cell theory are as described below:

All living organisms are composed of one or more cells.The cell is the basic unit of structure and organization in organisms.Cells arise from pre-existing cells.

The first of these tenets is disputed, as non-cellular entities such as viruses are sometimes considered life-forms.[1]

Answer 2

Credit for developing cell theory is usually given to three scientists:Theodor Schwann, Matthias Jakob Schleiden, and Rudolf Virchow. In 1839, Schwann and Schleidensuggested that cells were the basic unit of life

three postulate r-:

1)All organisms are made up of one or more cells.

2)Cells are basic units of structure and function in all organisms.

3)All cells come from cells that already exist.