Protection of living parts: The protoplasm of plant cells is surrounded by tough, thick and inert cell walls. Totally protects protoplasm from hostile environment. It protects the living part of the cell from external injury. As a result, the inner living parts are not damaged.
Shaping: It gives specific shape and form to each plant cell. As a result, the cells can be easily distinguished separately.
Stiffening: The cell wall is strong, firm and thick which gives strength to the cell.
Providing mechanical energy: It provides the required mechanical energy to the plant.
Transport: Cell wall contributes to the transport of water, mineral salts and food in the plant body. Acts as a conductor of extrinsic and intrinsic stimuli.
Absorption: The role of cell wall in absorption of water and mineral salts is undeniable. Because the main rom wall is semipermeable, pore water from the outside environment easily enters the mulrom.
Sensation: Sensation takes place through the cuticle and lenticels located in the cell wall. Cutin and suberin reduce the rate of respiration.
Immunity: The cell wall prevents microbes from entering the cell. Apart from this, if there is any bacteria on the cell wall, it will die due to salt like substance. As a result, the plant becomes disease resistant.
In paper and textile industry: As the cell wall contains cellulose, it is used as the main material of paper and textile industry. The demand for industrialization is increasing day by day.
Cell Separation: It separates two adjacent cells. As a result the separate entities of the two cells are maintained.
Intercellular communication: Two cells maintain intercellular communication through plasmodesmata located in the middle membrane.
Skeletal structure: Cell wall acts as a skeleton in the plant body.
As a source of nutrition: Herbivorous animals like goat, cow, sheep, buffalo, dumba, camel, deer, giraffe, rabbit, guinea pig etc. have cellulose digesting enzymes in their bodies. Cellulose-containing cell walls therefore act as a source of nutrients for animals. But as the human body does not have cellulose digesting (cellulase) enzyme, it is not used as food.