Cell wall plant

A plant cell wall is a firm layer outside the plasma membrane. It helps a cell keep its shape, withstand internal water pressure, and interact with neighboring cells. The wall is not the same structure as the cell membrane.

How it works

Most primary plant walls contain cellulose microfibrils embedded in a matrix of other carbohydrates and proteins. Some cells later form thicker secondary walls, which may contain lignin. Wall composition varies with cell type and developmental stage.

Example or application

A plant cell placed in a hypotonic environment can take up water; its wall resists excessive expansion. This support helps plant tissues stay firm while the membrane continues to regulate movement into and out of the cell.

Scope and limits

Cell walls are not exclusive to plants: fungi and many microorganisms also have walls, with different materials. Do not describe the plant wall as a waterproof shell; it is porous and works alongside the membrane.

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