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cell wall

Cell 

The basic structural and purposeful unit of life is cell. 
Cell structure varies in size and form. 

History of cell 

Robert Hooke in 1665, ascertained a bit of cork below the magnifier and noticed it to be created of tiny compartment that he referred to as “cells.” 
Robert Hooke derived the name, 'cell '.
 Anton Von Lewenhoek classified organisms in 2 varieties by the quantity of their cells. 
Unicellular cell
Multicellular cell

Theory of cell 

Metthias M. J. Schleiden and Theodore physiologist in 1938bproposed lthe cell doctrine that was later changed by Rudolf Virchow in 1885. 
The theory was All living organisms' area unit composed of cells and merchandise of the cells. 
All cells arise from pre-existing cells. 

Unicellular organism

 A living thing organism is AN organism that consists of one cell. 
They are generally microscopic and can't be seen with the optic. 
For example- amoeba, Paramecium, Euglena, flora, E coli etc.

Multicellular organism 

Organisms that consists of mire than one cell area unit called cellular organisms. 
Most cellular organisms' area unit visible to optic. 
For example- mud mites, plants, animals, insects, birds, mushrooms, etc.

 Components of the cell -cell wall

 The cell membrane is the out most layer of a cell. 

In plants, cell membrane composed of cellulose. 

The cell membrane protects the inner components if the cell.

The wall is rigid that it offers form to the cell, and doesn't permit distension of the cell, therefore, resulting in prolixity of the cell that's helpful in following ways- 

-It freely permits the movement of water and alternative chemicals into and out of the cells. 
-There area unit breaks within the primary wall of the adjacent cells through that protoplasm of 1 cell that is connected with the opposite. 
-These protoplasm strands that connect one cell to the opposite one is termed as plasmodesmata.

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