What are the factors affecting the rate of diffusion? | NCERT solution | Class 11 Biology | Unit-11 Transport in Plants



Q.1:- What are the factors affecting the rate of diffusion?

 

 

Answer:-

Factors affecting the rate of diffusion are :



Density – Rate of diffusion of a substance is inversely proportional to square root of its relative density (Graham’s Law).
Permeability of medium – Rate of diffusion decreases with density of the medium.
Temperature – A rise in temperature increases the rate of diffusion with Q10 = 1.2 -1.3. Because of it sugar crystals do not dissolve easily in ice cold water while they do so easily in warm water.
Diffusion pressure gradient – Rate of diffusion is directly proportional to the difference of diffusion pressure at the two ends of a system and inversely proportional to the distance between the two.