Question

Factors affecting the rate of diffusion are:

I. Gradient of concentration
II. Permeability of the membrane
III. Temperature
IV. Pressure
V. Size of diffusing material

• A. I, III and V are correct
• B. I and V are correct
• C. I, II, III, IV, V are correct
• D. Only V is correct

Answer 1

The correct option is A I, III and V are correct

• Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. It happens in liquids and gases because their particles move randomly from place to place.
• Factors affecting the rate of diffusion are concentration gradient, temperature, and size of diffusing material.
• The greater the difference in concentration, the more rapid the diffusion. The reverse is true for lighter molecules.
• Heavier molecules move more slowly, therefore, they diffuse more slowly. The reverse is true for lighter molecules.
• Higher temperature increases the energy and therefore the movement of molecules increases the rate of diffusion. Lower temperatures decrease the energy of molecules, thus decreasing the rate of diffusion.

So, the correct answer is 'I, III, and V.

Hence, option A is correct.