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CBSE - Class 12 Biology Human Health and Disease Worksheet

Name the primary and secondary lymphoid organs.

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

How does the transmission of each of the following diseases take place?
(a) Amoebiasis

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

The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(e) HIV

How does the transmission of each of the following diseases take place?
(c) Ascariasis

Differentiate the following and give examples of each:
(a) Innate and acquired immunity

Differentiate the following and give examples of each:
(b) Active and passive immunity

How does the transmission of each of the following diseases take place?
(b) Malaria

10.

List the harmful effects caused by alcohol/drug abuse.

11.

Draw a well-labelled diagram of an antibody molecule.

12.

The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(a) MALT

13.

The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(b) CMI

14.

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

15.

The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(d) NACO

16.

The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its full form:
(c) AIDS

17.

What are the various routes by which transmission of human immuno-deficiency virus takes place?

18.

How does the transmission of each of the following diseases take place?
(d) Pneumonia

19.

Explain what is meant by metastasis.

20.

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

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