Which organism given below has a shell?

Cucumaria

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Ophiura

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Octopus

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Pinctada

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Solution

The correct option is D Pinctada
The body of molluscs is covered and protected by a calcareous shell.
Pinctada and Octopus belong to phylum Mollusca. Pinctada is pearl oyster and has a bivalve shell. Octopus is an exception in phylum Mollusca as it does not have a shell.

Cucumaria (sea cucumber) and Ophiura (brittle star) belong to phylum Echinodermata. Members of phylum Echinodermata do not have shells.

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