WAEC Biology 2017 Objective — Question 1
Question 1 of 50 from the West African Examinations Council (WAEC) Biology 2017 Objective paper, with the correct answer and a full explanation.
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Which of the following groups of animals do not possess a nervous system?
- A. A. PoriferaCorrect
- B. B. Cnidaria
- C. C. Platyhelminthes
- D. D. Nematoda
Explanation
Porifera (sponges) do not have nervous, digestive or circulatory systems. Instead, they rely on a constant water flow through their bodies to obtain food, oxygen and to remove wastes.
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