Name the following:

(a) The photosensitive pigment present in the rods of the retina.

(b) The part which equalizes the air pressure in the middle and external ear.

(c) The ear ossicle attached to the tympanum.

(d) The tube which connects the cavity of the middle ear with the throat.

(e) The part of the eye responsible for its shape.

(f) The nerves which transmit impulse from ear to the brain.

(g) The photoreceptors found in the retina of the eye.

(h) The eye defect caused due to shortening of the eye ball from front to back.

Note the relationship between the first two words and suggest the suitable word/words for the fourth place.

(a) Cones : Iodopsin :: Rods: …………… .

(b) Eyes : Photoreceptors :: Ears : …………… .

(c) Ears : Auditory nerve :: Eyes : …………… .

(d) Ear pinna : Auricle :: Inner ear : …………… .

(e) Semi-circular canal : Ampulla :: Cochlea : …………… .

State whether the following statements are true (T) or false (F). If false, correct them by changing any one single word in each.

(a) Deafness is caused due to rupturing of the pinna.

(b) Semicircular canals are concerned with static (positional) balance.

Where are the following located? State their main functions:

(a) Yellow spot

(b) Lacrimal gland

(c) Organ of Corti

(d) Eustachian canal

(e) Incus