Cell wall is composed of long cellulose molecules grouped in bundles called microfibrils which, in turn,are twisted inti pope-like macrofibrils. The macrofibrils are embedded in a matrix of pectin (which are very adhesive) and hemicelluloses (which are wuite fluid). There may be a secondary cell wall,in which case the outer civering of the cell is arranged
Middle lamella:contains gume and calcium pectate to cement cells together.
The function of th cell wall is a mechanical one-pressure from the cell protoplast maintains cell turgidity. The wall is freely permeable to water and most solutes so thst the cell wall reppresents an inportant transport route-the apoplast system-throughour the plant body.