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WAEC Biology 2010 Question 10

Question 10

Excretion

Excretion in Paramecium sp. is by diffusion because

  1. A.its habitat is water and moist places.
  2. B.it has simple, small and few internal organs.
  3. C.it has a large surface area to volume ratio.
  4. D.it has a large efficient meganucleus.
Show the answer and explanation

Answer: C (it has a large surface area to volume ratio.)

Explanation

A tiny organism has a large surface compared with its volume, so wastes can diffuse out across its surface fast enough.