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81. Do you think that friends can influence one to take alcohol/ drugs ? If yes, how may one protect himself/herself from such an influence ?

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82.

Draw a sketch of action of HIV in the body.

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The two diseases caused by Aedes mosquitoes are
(i) Dengue (ii) Chickengunya.

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84. What causes swelling of the lower limbs in patients suffering from filariasis ?

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85. List any two adaptive features evolved in parasites enabling them to live successfully on their hosts.

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86. How do neutrophils acts as cellular barrier to pathogens in human ?

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87. Name the cells in which the HIV multiplies after gaining entry into human body.

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88. How does saliva act in body defence ?

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89. Name the type of cells that produce antibodies.

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90. How do virus infected cells provide immunity to healthy cells ?

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