First slide

Classification of Animals

Question

Which of the following have skeleton composed of calcium carbonate?

Easy

A

Aurelia, Physalia, Obelia
B

Meandrina, Sycon, Pila
C

Hydra, Sycon, Ctenoplana.
D

Ctenoplana, Physalia, Hydra

Solution

A calcareous skeleton is present in calcareous sponges (e.g., Sycon), cnidarian corals (e.g., Meandrina) and molluscs (e.g., Pila).

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