Book : Botany
Posted by: CHELSEA
M.J Scheiden in 1838 purposed that all plant made up of cell with cell wall in 1839, T.Schwann purposed that all animal tissue made up of cell and covered by cell membrances.Scheiden and Schwann united their udea and purposed in the cell theory.R-Virchow found in 1858 that all living cell rise from the pre-existing cell by cell division.The cell theory states that:\n\nAll the living organism are made up of single cell. All cell are similar chemical composition and metaboilic activies. All living organism start their life from a single cell. All cell are arised from the pre-existing cell. Every cell has capacity to totipotant. Cell contain the genetic unit or heridiatary unit which transfer from one generation to another. Multiplication of cell and their growth cause the growth of organisms.
Drawbacks of Cell Theory:
They are non living outside the living organism. Bacteria and blue green algae lacks organized nucleus. RBC and sieve tube lacks nucleus but they are living cells. Some Coencytic body is like mucor rhizopus (fungi) and vaucheria (algae) made up of a mass of protoplasm with many nucleus. These are not explainer in the cell theory.