Cell Wall Part (1)

CELL WALL       ( PART- 1)

               BACKGROUND :-

                                           Everything in the world has a boundary line like every Home, village, City, and country. This boundary line have a specific function it maintain the shape of country etc present in map. It also a protecting line as enemies cannot inter through it and the and the entire area are safe due

to this line.

                 Such like that the cell is also covered by a boundary 

line.

Cell Wall

DEFINITION:-

                           The outer most layer of plant cell is called CELL WALL.

• Animals cell have no cell wall.
• Cell wall is actually non living.

CELL WALL STRUCTURE

CHEMICAL COMPOSITION:-

                                                        Chemically cell composed of Carbohydrates such as Cellulose, hemi-cellulose, pectin, lignin and certain fatty substances like waxes.

MICROFIBRILS :-

                                  It is found in cell wall , actually it is a network lying in a gel-like matrix.It is mostly composed of cellulose. 

TYPES

There are three types of cell wall and that is :

(1). MIDDLE LAMELLA :-

                                                 A pectin rich cementing substance

between the walls of adjacent cells called Middle lamella.

(2). PRIMARY CELL WALL :-

                                                     The cell wall which is formed immediately after the division of cell called primary cell wall. ➽ Many kinds of plant cells have only primary cell wall around them.

  Composition:-

                                It is composed of pectin, hemi-cellulose and loose network of cellulose microfibrils.

(3). SECONDARY CELL WALL :-

                                                             It is a layer present inner surface of the primary cell wall called secondary cell wall.

⤘ This type of cell wall present in phloem and xylem.

Composition:- 

                          It is composed of cellulose, hemi-cellulose and lignin.

THREE TYPES STRUCTURE OF CELL WALL

FUNCTION

•  It give protection to the cell.
• It give mechanical support to the cell.
• It maintain shape of the cell.
• It also prevent cell from desiccation.

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