Share
Notifications

View all notifications
Advertisement

What is Cell Made up Of? What is the Structural Organisation of a Cell? - Cell Wall

Login
Create free account


      Forgot password?

notes

Cell Wall:

It is present only in plant cells. The cell wall is composed of cellulose and is permeable. It separates the contents of the cell from the surroundings. It gives shape and protection to the cell. 

When a living plant cell loses water through osmosis there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.

Cell walls permit the cells of plants, fungi and bacteria to withstand very dilute (hypotonic) external media without bursting. In such media the cells tend to take up water by osmosis. The cell swells, building up pressure against the cell wall. The wall exerts an equal pressure against the swollen cell. Because of their walls, such cells can withstand much greater changes in the surrounding medium than animal cells.

Functions:

  • It determines the shape and rigidity to the plant cell.

  • It protects the plasma membrane.

  • It prevents desiccation or dryness in cell.

  • It helps in the transport of various substances in and out of the cell.

 

notes

Cell Wall:

It is present only in plant cells. The cell wall is composed of cellulose and is permeable. It separates the contents of the cell from the surroundings. It gives shape and protection to the cell. cell walls permit the cell

When a living plant cell loses water through osmosis there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.

Cell walls permit the cells of plants, fungi and bacteria to withstand very dilute (hypotonic) external media without bursting. In such media the cells tend to take up water by osmosis. The cell swells, building up pressure against the cell wall. The wall exerts an equal pressure against the swollen cell. Because of their walls, such cells can withstand much greater changes in the surrounding medium than animal cells.

Functions:

  • It determines the shape and rigidity to the plant cell.

  • It protects the plasma membrane.

  • It prevents desiccation or dryness in cell.

  • It helps in the transport of various substances in and out of the cell.

Cell Wall

Shaalaa.com | Structure of cell - Cell wall

Shaalaa.com


Next video


Shaalaa.com


Structure of cell - Cell wall [00:09:10]
S
Series 1: playing of 1
series 1
0%


Advertisement
View in app×