Q1 of 102 Page 130

Categorize the following parts under

(i) External ear: _________________


(ii) Middle ear: _________________


(iii) internal ear: _________________


Eardrum, hammer, pinna, cochlea, anvil, stirrup, Eustachian tube, tympanum, oval window, semi-circular canals.

(i) Pinna, Eardrum, Tympanum


Explanation: The outer part of the ear (pinna) collects sound. Sound travels through the auricle and the auditory canal, a short tube that ends at the eardrum or Tympanum.


(ii) Hammer, Anvil, Stirrup, Oval window, Eustachian tube


Explanation: Hammer is the long handle attached to the eardrum. Anvil is the bridge bone between the malleus and the stapes. The stirrup is the footplate and the smallest bone in the body. The oval window connects the middle ear with the inner ear.


(iii) Semi-circular canals, Cochlea


Explanation: semicircular ducts are filled with fluid and are attached to cochlea and nerves. They send information on balance and head position to the brain. The cochlea is a spiral-shaped organ of hearing that transforms sound into signals and gets sent to the brain.


The categorized parts are:


































External ear



Middle ear



Internal ear



Ear drum



Hammer



Cochlea



Pinna



Anvil



Semi–circular canals



Tympanum



Stirrup





Eustachian tube





Oval window




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3

Name the following:

(i) Place of best vision in the retina of the eye __________________


(ii) Place of no vision in the retina of the eye __________________


(iii) Kind of retinal cells sensitive to dim light __________________


(iv) The circular opening enclosed by iris __________________


(v) The fibers which collectively hold the lens in position __________________


(vi) The capacity of the eye to focus at different distances __________________


(vii) The kind of lens required to correct nearsightedness __________________


(viii) The layer of the wall of the eye-ball that corresponds to the black lining of the box of a camera __________________

 4

Give the reason for the following:

(i) Medicines dropped in the eye flow down into the nose ___________________


(ii) A person from bright sunlight outside enters a poorly lit room and feels blinded for a short while ___________________

 2

State the functions of the following: -

(a) Semi-circular canals _____________


(b) Cochlea _____________


(c) Auditory nerve _____________

 3

Name the four fundamental tastes and the areas of the tongue which perceive them. …………………………………….