Question

Which among the following defines osmosis the best?

(a) Movement of water molecules from a region of its higher concentration to a region of lower concentration of water through a semipermeable membrane
(b) Movement of solvent molecules from its higher concentration to a lower concentration
(c) Movement of solvent molecules from a higher concentration to a lower concentration of solution through a permeable membrane
(d) Movement of solute molecules from a lower concentration to a higher concentration of a solution through a semipermeable membrane

Answer 1

(a) Movement of water molecules from a region of its higher concentration to a region of lower concentration of water through a semipermeable membrane
Osmosis is a process by which the water molecules pass from a region of low solute concentration to a region of high solute concentration through a semi-permeable membrane. It is a passive process and happens without any expenditure of energy.