Among the following which one is a diploblastic organism?
Correct answer: A. Hydra
- A. Hydra
- B. Crabs
- C. Squids
- D. Earthworm
Explanation
Hydra is diploblastic because its embryo develops two germ layers, ectoderm and endoderm, separated by mesoglea. Crabs, squids and earthworms are triploblastic and develop three germ layers. Students may choose a larger animal such as the crab, but body size is unrelated to the number of germ layers.
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