In mammals,what has developed as the external | vedclass

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(A) In mammals,the external ear is represented by the pinna (auricle). $1$. The pinna is a cartilaginous structure that helps in collecting sound wave

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Pinna

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(A) In mammals,the external ear is represented by the pinna (auricle). $1$. The pinna is a cartilaginous structure that helps in collecting sound waves from the environment. $2$. Ear ossicles ($Malleus$,$Incus$,$Stapes$) are part of the middle ear. $3$. The tympanic membrane (eardrum) separates the external ear from the middle ear. $4$. The auditory meatus is the canal leading to the eardrum. Therefore,the correct answer is $A$.

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 mammals,what has developed as the external ear?

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The opening in the nasopharynx that permits air pressure on both sides of the tympanic membrane of the ear to be kept equal is

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

The basilar membrane separates .......... .

Structures filled with perilymph - $P$
Structures filled with endolymph - $Q$
$I -$ Scala vestibuli,$II -$ Scala tympani,$III -$ Scala media
Select the correct option for $P$ and $Q$.
$P \quad\quad Q$

The eighth cranial nerve of a frog connects the brain to the:

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