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Which of the following animal groups is incorrectly paired with its characteristic?

Porifera : Central cavity called spongocoel lined by choanocytes
Mollusca : The body is covered by a chitinous exoskeleton
Cnidaria : Gastro-vascular cavity with a single opening, mouth on hypostome
Arthropoda : Jointed appendages help in locomotion

detailed solution

Correct option is B

Body is covered by a calcareous shell in molluscs. Body is covered by chitinous exoskeleton in arthropods.

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