Hint: Osmosis: Solvent molecules pass through semi-permeable membranes towards the solution side 

In osmosis, the movement of a solvent (such as water) through a semipermeable membrane (as of a living cell) into a solution of higher solute concentration from lower solute concentration.

When an electric potential is applied across two platinum electrodes dipping in a colloidal solution, the colloidal particles move towards one or the other electrode. The movement of colloidal particles under an applied electric potential is called electrophoresis.

When electrophoresis, i.e., movement of particles is prevented by some suitable means, it is observed that the dispersion medium begins to move in an electric field. This phenomenon is termed electroosmosis.

Reverse osmosis is a process that uses a membrane under pressure to separate relatively pure water (or other solvent) from a less pure solution. When two aqueous solutions of different concentrations are separated by a semi-permeable membrane, water passes through the membrane in the direction of the more concentrated solution as a result of osmotic pressure.