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A good example of a diploblastic organism is…

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A good example of a diploblastic organism is

A. amoeba

B. hydra

C. earthworm

D. roundworm




Diploblastic and triploblastic animals are animals that have two and three embryonic cell layers respectively… to put it simple, radially symmetrical animals like hydra, coelenterates, and jellyfishes are diploblastic, while bilaterally symmetrical animals are triploblastic.

Now for the right answer to the above question:

  1. A is not the right answer. Amoeba is a one-celled protozoan. It does not possess any embryonic cell layer, hence is neither diploblastic nor triploblastic
  2. B is correct. hydra is diploblastic.
  3. C is incorrect. earthworm is triploblastic.
  4. D is incorrect. roundworm is also triploblastic.


You may please note this/these:

  • Diploblastic animals possess endoderm and ectoderm only.
  • Triploblastic animals possess endoderm, mesoderm, and ectoderm.
  • Examples of diploblastic animals are coelenterates, jellyfish, hydra, and generally radially symmetrical animals.

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/ culled from 2019 JAMB-UTME biology past question 30 /

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