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WAEC Biology 2002 Question 12

Question 12

Cell and Its Environment

Diffusion is most effective in living organisms, when the surface area is

  1. A.large and the thickness is also large
  2. B.small while the thickness is large
  3. C.large while the thickness is small
  4. D.the same as its thickness.
Show the answer and explanation

Answer: C (large while the thickness is small)

Explanation

A large surface lets more molecules pass at once, and a thin surface gives them a short distance to travel, so diffusion is fastest.