Q2 of 102 Page 130

With reference to the human ear, answer the questions that follow:

(a) Give the technical term for the structure found in the inner ear.


(b) Name the three small bones present in the middle ear.


What is the biological term for them collectively?


(c) Name the part of the ear associated with


(d) Name the nerve, which transmits messages from the ear to the brain.

(a) The middle ear or membranous labyrinth has two structures inside it, the cochlea and the semi-circular canals.


(b) The ossicles are, in order from the eardrum to the inner ear. The malleus, incus, and stapes, terms that in Latin are translated as "the hammer, anvil, and stirrup".


(c) (1) static balance - Utriculus and sacculus (inner ear)


(2) hearing – internal parts of the ear


(3) dynamic balance - Semi-circular canals (inner ear)


(d) The auditory nerve is a bundle of nerve fibers that carries hearing information between the cochlea the brain.


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8

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

 1

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

 3

The figure below compares a part of our eye with a part of a photographic camera


(a) Name the corresponding parts of the eye and the camera shown here that are comparable in function.


(b) Explain the mode of working and the function of the parts of the eye mentioned above.

 4

Given below is a diagram depicting a defect of the human eye. Study the same and answer the questions that follow:


(a) Name the defect shown in the diagram.


(b) Give two possible reasons for this defect.


(c) Name the parts labelled 1 to 4.


(d) Name the type of lens used to correct this eye defect


(e) Draw a labelled diagram to show how the above-mentioned defect is rectified using the lens named above.