First slide

Classification of Animals

Question

Which of the following is not a similarity between Obelia and Pleurobrachia?

Moderate

A

Two embryonic cell layers – ectoderm and endoderm
B

Intracellular and extracellular digestion
C

Alternation of polyp and medusa generations
D

Tissue level of organisation

Solution

Ctenophores due not exhibit polyp and medusa generation. Both cnidarians and ctenophores are diploblastic with tissue level of organisation and exhibit both intracellular and extracellular digestion.

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