Question: Which is the first triploblastic animals group?

  1. Cnidaria
  2. Platyhelminthes
  3. Annelida
  4. Chordata
Answer: b. Platyhelminthes

All above mentioned animals group is phylum under Kingdom Animalia. Platyhelminthes is the first triploblastic animals group. They have all three germ layers i.e. ectoderm (outer layer), mesoderm (middle layer) and endoderm (inner layer).

Annelida and Chordata are also triploblastic animals. Cnidaria is a diploblastic animal.

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