Mark the odd item in each series:
Semi-circular canals; cochlea; polarized membrane; ampulla.

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Solution

Semi-circular canals:
They are three fluid-filled tubes present in the inner ear which help in balance.
Cochlea:
The cochlea is a snail-shaped bony tube present in the inner ear that is hollow. It is vital for hearing.
Polarized membrane:
A polarized membrane is a membrane that is charged having an electrical charge on its surface.
Ampullae:
Part of the inner ear in the vestibular apparatus surrounds sensory receptors in the semicircular canals.
The polarized membrane is the odd term out as it is not present in the human ear, unlike the other parts.

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Mark the odd item in each series:Semi-circular canals; cochlea; polarized membrane; ampulla.

Mark the odd item in each series:
Semi-circular canals; cochlea; polarized membrane; ampulla.