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WAEC Biology 2019 Question 7

Question 7

Cell and Its Environment

The rate of diffusion of molecules between two media will be higher if

  1. A.the difference in concentration of the two media is low.
  2. B.the difference in concentration of the two media is negligible.
  3. C.the difference in concentration of the two media is high.
  4. D.there is no difference in the concentration of the two media.
Show the answer and explanation

Answer: C (the difference in concentration of the two media is high.)

Explanation

The bigger the difference in concentration (the steeper the gradient), the faster molecules diffuse from the high to the low concentration.