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JAMB Biology 1992 Question 4

Question 4

Animal Kingdom

A major difference between platyhelminthes and coelenterates is that platyhelminthes

  1. A.are multicellular
  2. B.have developed a mesoderm
  3. C.reproduce sexually
  4. D.reproduce asexually.
Show the answer and explanation

Answer: B (have developed a mesoderm)

Explanation

Flatworms are triploblastic (they have a middle layer, the mesoderm), while coelenterates have only two cell layers. Both groups are multicellular and reproduce in both ways.