Q3 of 328 Page 300

Discuss with the help of suitable examples three ways in which microorganisms can find entry into human body.

(a) The microorganism can find entry through contaminated food and water and diseases are Cholera and Typhoid.


(b) By Mosquitoes. Malaria by bite of female Anopheles, dengue by bite of Aedes.


(c) Sexual contact. Syphilis, AIDS.

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2

Discuss briefly the principle of immunization.

 2

Mention any two diseases that can be prevented by immunization.

 4

Which of the following disease are protozoan in origin?

Dengue, Malaria, Kala-azar and HIV-AIDS

 4

Suggest any two ways to prevent being infected by protozoa.