The outermost boundary in most plant cells is called Cell Wall. Plants and prokaryotes have different types of cell walls. The plant cell wall is different from the cell walls of prokaryotes. These walls have different structures and chemical compositions.
The cell wall is secreted by the protoplasm of the cell. The thickness of the cell wall is different in different types of cells. The cell wall is composed of three basic layers: primary wall, secondary wall, and middle lamella.
The primary wall is mainly composed of cellulose. Primary Wall also contains some pectin and hemicelluloses. It is a true cell wall. It develops in the newly growing cells. The cellulose molecules are arranged in a criss-cross manner.
It is produced on the outer side of the plasma membrane in a young plant cell. Primary Wall is thin and elastic. It is made up of cellulose.
The secondary wall is formed on the inner surface of the primary wall. It is much thick and rigid. Chemically, it is composed of inorganic salts, silica, waxes, cutin, lignin, etc.
It is produced in an old cell on the inner side of the primary wall. Due to the secondary wall, the cell wall becomes stronger and non-elastic.
It is present between the walls of two adjacent cells in their attachment.
Cellulose is absent in the cell wall of prokaryotes. Their wall is composed of peptidoglycan or murein. The cell wall of fungi contains chitin.
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