Which of the following membranes given us the ability to discriminate different pitches of sound ?
(a) Membrane covering the round window
(b) Tympanic membrane
(c ) Tectorial membrane
(d) Basilar membrane

Explanation

Basilar membrane gives us the ability to discriminate different pitches of sound. This is because the different regions of the basilar membrane vibrate best at different frequencies of the sound, from which the brain infers the pitch.