Movement of molecules of a substance from the region of their higher concentration to the region of their lower concentration without the involvement of a separating membrane is called
(a) Osmosis (b) Diffusion
(c) Active transport (d) Capillarity
Diffusion is the net movement of molecules or atoms from a region of high concentration (or high chemical potential) to a region of low concentration (or low chemical potential) as a result of a random motion of the molecules or atoms. Diffusion is driven by a gradient in chemical potential of the diffusing species.
Option b is correct