cell wall

A cell wall is a tough, protective outer covering found outside the cell membrane in plant cells (and also in fungi and many bacteria).

• Position: It lies outside the cell membrane, like an extra strong “coat” around the cell.
• What it is made of (in plants): Mostly cellulose, a strong material that also forms much of the fibre in plant foods.
• Main job: It gives the cell shape, rigidity, and strength, helping plants stand upright and keeping cells from collapsing.
• Protection: It acts like a shield against small injuries and helps the cell stay safe from changes in the surroundings.
• Water control idea: When a lot of water enters a plant cell, the cell wall resists too much swelling, so the cell becomes firm instead of bursting—this firmness is one reason fresh leaves feel crisp.
• Plant vs animal cells: Animal cells do not have a cell wall, which is one reason they are usually more flexible in shape than plant cells.

So, the cell wall is like the strong outer frame of a plant cell—supporting it, protecting it, and helping the whole plant stay sturdy.