State cell theory. Name the scientist who presented it.
Q. State cell theory. Name the scientist who presented it.
Ans. Cell theory is :
(i) All the plants and animals are composed of cells.
(ii) Cell is the basic unit of life.
The cell theory was presented by Schleiden (1838) and Schwann (1839).
The cell theory was further expanded by Virchow (1855) by suggesting that all cells arise from pre-existing cells.
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