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JAMB Biology 1992 Question 5

Question 5

Animal Kingdom

The essential structural difference between hydra and tapeworm is that while hydra

  1. A.has tentacles, tapeworm is parasitic
  2. B.is diploblastic, tapeworm is triplobastic
  3. C.has a mouth, tapeworm feeds by suckers
  4. D.has mesoderm, tapeworm has mesogloea.
Show the answer and explanation

Answer: B (is diploblastic, tapeworm is triplobastic)

Explanation

Hydra has two body layers (diploblastic) joined by jelly-like mesogloea; the tapeworm has three layers (triploblastic). Being parasitic is a way of life, not a structure.