Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 5 - No. 19)
Which of the following would increase the rate of diffusion of a substance across a cell membrane?
Increasing the temperature.
Decreasing the concentration gradient.
Increasing the surface area of the membrane.
Decreasing the size of the diffusing molecules.
Explanation
Higher temperature gives the molecules more kinetic energy; a larger surface area provides more space for diffusion, and smaller molecules diffuse more easily.
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