what is cell what is cell theory
Dear Student
The cell is the basic structural, functional and biological unit of all known living organisms. Cells are the smallest unit of life and are often called the "building blocks of life".
The cell was discovered by Robert Hooke.
The cell theory was proposed by two scientists- Schleiden (1838)and Schwann (1839). It says that all the plants and animals are composed of cells and the cell is the basic unit of life. The cell theory was further expanded by Virchow (1855) by suggesting that all cells arise from pre-existing cells.
Key points of the cell theory are as follows:
- All known living things are made up of one or more cells.
- All cells arise from pre-existing cells by division.
- The cell is the fundamental unit of structure and function in all living organisms.
- The activity of an organism depends on the total activity of independent cells.
- Energy flow occurs within cells.
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