Diffusion is a phenomenon explaining movement of substances from its higher concentration to its lower concentration. In plants, diffusion of gases occurs.
Factors affecting diffusion are:-
(i) Concentration gradient:- More steeper the concentration gradient, greater will be the diffusion.
(ii) Temperature:- Diffusion rate increase with increase in the temperature because speed of ions increases.
(iii) Size of molecules:- Molecules with smaller size can diffuse easily as compared to molecules with larger size.