The thin, transparent extension of sclerotic layer found in front of the lens is:

1. Cornea
2. Cochlea
3. Conjunctiva
4. Choroid

The part of the inner ear which is responsible for hearing is :

1. Semicircular canal
2. Utriculus
3. Cochlea
4. Sacculus

Which of the following structures equalises the air pressure on either side of the tympanum ?

1. Auditory tube
2. Eustachian tube
3. Vestibular canal
4. Tympanic canal

Garima feels difficulty in seeing in dim light and during nights. Which of the following could not be the cause of her condition ?

1. Deficiency of vitamin A.
2. Non-formation of the pigment visual purple.
3. Excessive synthesis of pigment iodopsin.
4. Rods do not synthesize the pigment rhodopsin.