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JAMB Biology 1988 Question 6

Question 6

Evolution

Which of the following sets of organisms represents the correct trend from simple to complex structural organization? 1 Mollusca 2 Platyhelminthes 3 Nematoda 4 Protozoa

  1. A.4 → 1 → 2 → 3
  2. B.4 → 3 → 2 → 1
  3. C.4 → 2 → 1 → 3
  4. D.4 → 2 → 3 → 1
Show the answer and explanation

Answer: D (4 → 2 → 3 → 1)

Explanation

Protozoa are single-celled, flatworms have three cell layers but no body cavity, roundworms have a simple body cavity, and molluscs have organ systems and a true coelom.