Q7 of 102 Page 130

Name the three ear ossicles. How do they contributee to the mechanism of hearing?

● The three ear ossicles are Malleus (hammer), Incus (anvil) and Stapes (stirrup).


● The last ear ossicle, stapes, vibrates and transmits the vibration to the oval window.


● The role of other two ear ossicles is to magnify the vibration of stapes as a result of their lever-like action.


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What is meant by Power of accommodation of the eye? Name the muscles of the eye responsible for the same...................................................

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With reference to the functioning of the eye, answer the questions that follow:

(a) What is meant by the power of accommodation of the eye?


(b) What is the shape of the lens during (1) near vision (2) distant vision ?


(c) Name the two structures in the eye responsible for bringing about the change in the shape of the lens.


(d) Name the cells of the retina and their respective pigments which get activated