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