First slide

Classification of Animals

Question

Which of the following is incorrect?

Easy

A

Pheretima – Nephridia help in excretion and osmoregulation
B

Naja – Sheds exoskeleton as skin cast
C

Echinus – Ventral mouth and dorsal anus
D

Scoliodon – Air bladder regulates buoyancy

Solution

Scoliodon is a cartilaginous fish which lacks air bladder. Due to the absence of air bladder, they have to swim constantly to avoid sinking. An air bladder is characteristically found in bony fishes (Osteichthyes).

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