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

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

Q. Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit?

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

Q. Name the primary and secondary lymphoid organs.

Q. Explain what is meant by metastasis.

Q. What measure would you take to prevent water-borne diseases?

Q. Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?

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

Q. 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

Q. What are the various routes by which transmission of the Human Immunodeficiency Virus takes place?

Q. Draw a well-labelled diagram of an antibody molecule.

Q. List the harmful effects caused by alcohol/drug abuse.

Q. How is a cancerous cell different from a normal cell?

Q. Differentiate between the following with examples:
(a) Innate and acquired immunity
(b) Active and passive immunity

Q. How does the transmission of amoebiasis diseases take place?

Q. Discuss with your teacher what does a suitable gene means, in the context of DNA vaccines.