Q5 of 102 Page 130

Given below are two sets (a) and (b) of five-part in each. Rewrite them in the correct sequence.

(a) The cochlea, tympanum, auditory canal, ear ossicles, oval window.


(b) Conjunctiva, retina, cornea, optic nerve, lens.

(a) Auditory canal, tympanum, ear ossicles, oval window, cochlea.


Explanation: This is the path a sound wave travels when it enters the human ear.


(b) Conjunctiva, cornea, lens, retina, optic nerve.


Explanation: This is the path of a light ray that enters the eyeball when a human lays eyes on it.


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3

Mention, where in living the following located and state their main functions:

(a) Fovea centralis


(b) Organ of Corti

 4

Mention if the following statements are true (T) or false (F). Give reason.

(a) Sometimes medicines dropped into the eyes come into the nose and even throat. (T/F)


(b) Ciliary muscles regulate the size of the pupil. (T/F)


(c) A yellow spot of the retina is the region of colour vision. (T/F)


(d) The auditory nerve is purely for perceiving sound. (T/F)


(e) Malleus, incus, and stapes are collectively called the ear ossicles. (T/F)


(f) Flavour and taste are one and the same thing. (T/F)


(g) Short-sightedness and hyperopia are one and the same thing. (T/F)


(h) The blind spot is called so because no image is formed on it. (T/F)

 6

Given below are certain structures. Write against each their special functional activity.

Organ of Corti and …………………….

 6

Given below are certain structures. Write against each their special functional activity.

Olfactory nerve and ………………….