The part of the ear where sound is transduced is:

Helicotrema is

$P$ is a continuous tubular structure. Inside these tubes, $Q$ is arranged.
$\quad\quad\quad P \quad\quad\quad Q$
$(A)$ $Scala \text{ vestibuli} \quad$ $Scala \text{ media}$
$(B)$ $Scala \text{ media} \quad$ $Scala \text{ tympani}$
$(C)$ $Scala \text{ tympani} \quad$ $Scala \text{ media}$
$(D)$ $Scala \text{ media} \quad$ $Scala \text{ vestibuli}$

The Organ of Corti sends sound impulses to the cerebrum through which cranial nerve?

Eustachian tube connects .......$A$......... cavity with ......$B$......

The ear ossicles in the human ear are: