Which of the following is not considered as an exoskeleton in animals?

Scales of molluscs

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Cartilage of vertebrates

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Spicules of sponges

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Sclerites of cockroach

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Solution

The correct option is D Spicules of sponges
Scales of molluscs, cartilage of vertebrates and sclerites of cockroach are examples of exoskeletal as they cover these organisms externally by providing a rigid outer covering.
Spicules of sponges work as endoskeletal instead of exoskeletal.
So, the correct option is 'Spicules of sponges'.

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