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Solution


Q.

At which stage of HIV infection does one usually show symptoms of AIDS             [2014]
1 Within 15 days of sexual contact with an infected person  
2 When the infected retro virus enters host cells  
3 When HIV damages large number of helper T-lymphocytes  
4 When the viral DNA is produced by reverse transcriptase  

Ans.

(3)

AIDS is a disorder of cell-mediated immune system of the body. Virus responsible for AIDS is HIV (Human Immunodeficiency Virus). There is a reduction in the number of helper T-cells which stimulate antibody production by B-cells. This results in the loss of natural defence against viral infection.