Each particular plant cell has structural adaptations that give it a specific function. Types of plant cells include parenchyma, collenchyma and schlerenchyma. Parenchyma cells are relatively unspecialised, with thin, flexible primary walls.
Most parenchyma cells lack secondary cell walls.
The fleshy tissue of most fruit is composed of parenchyma cells. Mature parenchyma cells do not generally undergo cell division but most retain the ability to divide and differentiate into other plant cell types under certain conditions eg. during repair after injury. Some parenchyma cells in stems and roots have colourless plastids that store starch. Collenchyma cells have unevenly thickened primary cell walls and are grouped into strands or cylinders. They lack a secondary cell wall.