Give information about the chemical composition and function of the cell wall.

(N/A) $\Rightarrow$ $A$ non-living rigid structure called the cell wall forms an outer covering for the plasma membrane of fungi and plants.
$\Rightarrow$ The cell wall not only gives shape to the cell and protects the cell from mechanical damage and infection,but it also helps in cell-to-cell interaction and provides a barrier to undesirable macromolecules.
$\Rightarrow$ Algae have a cell wall made of cellulose,galactans,mannans,and minerals like calcium carbonate.
$\Rightarrow$ In other plants,it consists of cellulose,hemicellulose,pectins,and proteins.
$\Rightarrow$ The cell wall of a young plant cell,the primary wall,is capable of growth,which gradually diminishes as the cell matures and the secondary wall is formed on the inner side of the cell.
$\Rightarrow$ The middle lamella is a layer mainly of calcium pectate which holds or glues the different neighbouring cells together.
$\Rightarrow$ The cell wall and middle lamellae may be traversed by plasmodesmata which connect the cytoplasm of neighbouring cells.