Concept: This question tests your understanding of the pathway of sound transmission through the human ear, specifically how sound energy is converted and propagated from the external environment to the inner ear.

Why (A) is correct: Sound waves first enter the auditory canal (external auditory meatus). These waves then strike the eardrum (tympanic membrane), causing it to vibrate. These vibrations are amplified and transmitted by the three tiny bones of the middle ear, collectively called the ear ossicles (malleus, incus, stapes). Finally, the vibrations are transferred to the fluid-filled cochlea in the inner ear, where they are converted into electrical signals.

Why other options are wrong:

B) Eardrum is not the first structure sound waves encounter; the auditory canal is. The order of ear bones and cochlea is also incorrect.

C) Ear bones do not come before the eardrum in the sound transmission pathway.

D) Eardrum is not the first structure sound waves encounter; the auditory canal is.

Common Mistake: Students often confuse the order of structures in the middle ear or forget the initial role of the auditory canal.

NEET Tip / Mnemonic: Remember the sequence as All Ears Eat Corn: Auditory canal → Eardrum → Ear bones → Cochlea.

Correct Answer: (A)