(a) A plant cell has a cell membrane and cell wall as its boundary. The cell wall is freely permeable to water, hence it is not barrier to movement.
(b) In plant cells, the cells usually contains a large central vacuole, whose contents, the vacuolar sap, contribute to the solute potential of the cell.
(c) The cell membrane and the membrane of the
vacuole, the tonoplast, together are important determinants of movement of molecules into the cell.