First slide

Classification of Animals

Question

Which phylum is characterised by the presence of undifferentiated mesoglea between ectoderm and endoderm?

Easy

A

Platyhelminthes
B

Cnidaria
C

Porifera
D

Aschelminthes

Solution

Cnidarians have a mesoglea between ectoderm and endoderm. They are diploblastic organisms.
Platyhelminthes and Aschelminthes are triploblastic organisms (with ectoderm, mesoderm and endoderm).
Poriferans have mesohyl between pinacoderm and choanoderm.

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