CLASS IX NCERT SCIENCE Chapter 5 Fundamental Unit of Life : Cell
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Discovery Of Cell Discovered by Robert Hooke in 1665. observed cell in a cork slice with the help of primitive microscope. Cork is a substance which comes from bark of a tree.
Cork resembled the structure of a honeycomb consisting of many compartments. Cell is derived from a Latin word cellula, meaning a little room, He published his work in a book "Micrographia".
Other Discoveries Anton von Leeuwenhoek made an improved microscope and using this microscope he discovered free living cells in pond water. Robert Brown discovered nucleus in the cell. Purkinje in 1839 coined the term 'protoplasm' for the fluid substance of the cell. Haeckel established that the nucleus was responsible for storing and transmitting hereditary characters.
Cell Theory By Schleiden and Schwann. First Schleiden proposed the idea that all plants consists of cells. Schwann asserted that all animals and plants are made up of cells. This joint finding forms the basis of the cell theory. In 1855 Virchow published a statement based on his observations Omnis cellulae a cellula.
Cell Theory The cell theory comprise of following postulates. All organisms are composed of cells and its cell products. cells are structural and functional Unit of life. All cells arise from pre-existing cells.
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