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CBSE - Class 12 Biology Human Health and Disease Worksheet

1.
What measure would you take to prevent water-borne diseases?
2.
Discuss with your teacher what does ‘a suitable gene’ means, in the context of DNA vaccines.
3.
What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
4.
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(a) MALT
5.
What are the various routes by which transmission of human immuno-deficiency virus takes place?
6.
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(b) CMI
7.
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(c) AIDS
8.
In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?
9.
What are the various public health measures, which you would suggest as safeguard against infectious diseases?
10.
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(d) NACO
11.
How does the transmission of each of the following diseases take place?
(b) Malaria
12.
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(e) HIV
13.
How does the transmission of each of the following diseases take place?
(c) Ascariasis
14.
Explain what is meant by metastasis.
15.
How is a cancerous cell different from a normal cell?
16.
Name the primary and secondary lymphoid organs.
17.
Draw a well-labelled diagram of an antibody molecule.
18.
Differentiate the following and give examples of each:
(b) Active and passive immunity
19.
In which way has the study of biology helped us to control infectious diseases?
20.
Differentiate the following and give examples of each:
(a) Innate and acquired immunity

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