3. Which one of the following is the best definition of osmosis (i) The movement of water from a concentrated solution to a dilute
solution across a partially permeable membrane.
(ii) The movement of a dissolved substance from a concentrated solution to a
dilute solution across a partially permeable membrane.
(iii) The movement of water from a dilute solution to a concentrated
solution across a partially permeable membrane.
(iv) The uptake of water by a living cell.