WAEC Biology 2009 Objective — Question 10
Question 10 of 60 from the West African Examinations Council (WAEC) Biology 2009 Objective paper, with the correct answer and a full explanation.
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Excretion in Paramecium sp. is by diffusion because
- A. A. its habitat is water and moist places
- B. B. it has simple, small and few internal organs
- C. C. it has a large surface area to volume ratioCorrect
- D. D. it has a large efficient meganucleus
Explanation
Diffusion is an efficient means of transport in protozoans because these organisms have a large surface area to volume ratio.
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