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101. Discuss about photoreceptors.

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102. Name the different muscles controlling the movement of eyeballs and their functions.

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103.

Explain the following processes:

(a) Polarisation of the membrane of a nerve fibre.

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104. How does vitamin A deficiency affect the vision in humans ?

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105. Explain the following processes

(b) Depolarisation of the membrane of a nerve fibre.

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106. Explain the following processes

(c) Conduction of a nerve impulse along a nerve fibre.

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Disorders of eye :

1. Myopia or Shortsightedness

2. Hypermetropia or Farsightedness

3. Astigmatism

4. Presbyopia

5. Cataract

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108. Comment upon the term ‘windows’ present in human ear.

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109. What causes giddiness when a person spins his body rapidly ?

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110. Which parts of the nervous system participate in the maintenance of balance & coordinated body movements ?

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