Q. Which part of the human ear plays no role in hearing as such but is otherwise very much required?

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Solution:

Vestibular apparatus is a part of inner ear which is located above the choclea. It consists of three semicircular canals, which detect movements of the head, and the utriculus and sacculus which detect the position of head. It does not play any role in hearing but is responsible for maintaining the balance of the body and posture, thus necessary.