The ear ossicle 'incus' is a modified form of which bone?

The fluid found in the semicircular canals of the internal ear of a rabbit is .....

The maculae are present on the acoustic ridges which are found in

Match the following columns and select the correct option.

Column-$I$	Column-$II$
$(a)$ Organ of Corti	$(i)$ Connects middle ear and pharynx
$(b)$ Cochlea	$(ii)$ Coiled part of the labyrinth
$(c)$ Eustachian tube	$(iii)$ Attached to the oval window
$(d)$ Stapes	$(iv)$ Located on the basilar membrane

In the mammalian ear,the membranous structure that separates the $scala$ $vestibuli$ and $scala$ $media$ is:

Select the correct sequence for the mechanism of hearing.
$I -$ Sound waves,$II -$ Oval window,$III -$ Hair cells press against the tectorial membrane,$IV -$ Auditory cortex,$V -$ Auditory nerve,$VI -$ Waves in lymph,$VII -$ Tympanic membrane,$VIII -$ Movement in basilar membrane,$IX -$ Ear ossicles,$X -$ Generation of nerve impulses.