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JAMB Biology 2014 Question 15

Question 15

Transport in Animals

A circulatory system is very essential in mammals but not in smaller organisms like Amoeba because

  1. A.Amoeba lives in freshwater.
  2. B.diffusion is sufficient to transport materials in Amoeba.
  3. C.Amoeba lacks bood, containing haemoglobin.
  4. D.Amoeba exhibits anaerobic respiration.
Show the answer and explanation

Answer: B (diffusion is sufficient to transport materials in Amoeba.)

Explanation

Amoeba is tiny with a large surface area to volume ratio, so diffusion alone moves materials fast enough; large mammals need a transport system.