Q6 of 102 Page 130

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

Organ of Corti and …………………….

Organ of Corti and hearing.


Explanation: The organ of Corti, or spiral organ, is the receptor organ for hearing and is located in the mammalian cochlea. This highly varied strip of epithelial cells allows for transduction of auditory signals into nerve impulses' action potential.


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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)

 5

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.

 6

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

Olfactory nerve and ………………….

 6

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

Retina and ………………………………….