Biology for IGCSE & O level - Movement Into And Out Of Cells (Section 4 - No. 38)
Which of the following statements best describes the movement of molecules during diffusion?
Molecules move from a region of low concentration to a region of high concentration, without the need of energy.
Molecules move randomly, with the overall net movement from a region of high concentration to a region of low concentration.
Molecules require energy to move across a membrane from a region of low concentration to a region of high concentration.
Molecules always move in the same direction, from an area of high to an area of low concentration.
Explanation
Diffusion is the random movement of molecules, which leads to an overall net movement from an area of high concentration to an area of low concentration.
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