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

Draw a well-labelled diagram of an antibody molecule.

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

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

How is a cancerous cell different from a normal cell?

Explain what is meant by metastasis.

List the harmful effects caused by alcohol/drug abuse.

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.

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

130.

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