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WAEC Biology 1991 (August) Question 5

Question 5

Cell and Its Environment

Which of the following statements is correct about diffusion?

  1. A.It involves the movement of water molecules only
  2. B.Molecules move from a region of higher concentration to a region of lower concentration
  3. C.Differentially permeable membrane must be present for diffusion to occur
  4. D.It involves the movement of only solute molecules into the Bowman's capsule
  5. E.It occurs when a solute can no longer dissolve in a solvent
Show the answer and explanation

Answer: B (Molecules move from a region of higher concentration to a region of lower concentration)

Explanation

Diffusion is the spreading of particles from where they are more concentrated to where they are less concentrated; no membrane is needed.