(a) A time-bound vaccination programme is followed for the children in our country from their birth up to ten years of age. A graph plotted below…

A time-bound vaccination programme is followed for the children in our country from their birth up to ten years of age. A graph plotted below shows the effect of the vaccination followed by infection by the same pathogen, and the antibody concentration in the blood of the child.

Explain why the administration of a vaccine causes an increase in the antibody concentration.

If the child is infected with the same pathogen almost four months later, the antibody concentration in his/her blood increases very fast. Explain why.

A table given below gives information about different types of immunity and how they are attained. Identify 'P', 'Q', 'R', 'S' and ' T ' in the table.

	Type of immunity	Production of antibodies	Presence of memory cells	Mode attained
($\displaystyle 1$)	Natural, active	Yes	'P'	'Q'
($\displaystyle 2$)	Natural, passive	No	'R'	Across the placenta during pregnancy/breast feeding
($\displaystyle 3$)	Acquired, active	'S'	Yes	Getting a vaccine during breast feeding
($\displaystyle 4$)	Acquired, passive	'T'	No	Getting an injection of antibodies

What is the chemical name of 'smack'? Why is the consumption of smack considered as an abuse ?

Name the source plant and one effect of the following drugs on the human body :

Marijuana

Cocaine

Morphine