In which part of the plant does exosmosis and endosmosis occur?

Endosmosis is the movement of water from outside to inside of the cell. In hypotonic solution, concentration of the solvent is high outside the cell. Therefore, water/solvent enters the cell causing the contents of the plant cell to press against the cell wall. In hypertonic solution, exosmosis will take place, i.e. the solvent/water will move from inside to outside of the cell.