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Class 12
Zoology :-NCERT Solutions - Human Health and Diseases

Question 1
What are the various public health measures, which you would suggest as safeguard against infectious diseases?


Answer

Question 2

In which way has the study of biology helped us to control infectious diseases?


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Question 3
How does the transmission of each of the following diseases take place?
(a) Amoebiasis
(b) Malaria
(c) Ascariasis
(d) Pneumonia


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Question 4
What measure would you take to prevent water-borne diseases?


Answer

Question 7
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(a) MALT
(b) CMI
(c) AIDS
(d) NACO
(e) HIV


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Question 8
Differentiate the following and give examples of each:
(a) Innate and acquired immunity
(b) Active and passive immunity


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Question 10
What are the various routes by which transmission of human immunodeficiency virus takes place?


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Question 11
What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?


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Question 12
How is a cancerous cell different from a normal cell?


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Question 15
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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Question 16
Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.


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Question 17
In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?


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