The term ’active immunity' means
Resistance developed after disease
Resistance developed before disease
Resistance rate of heart beat
Increasing quantity of blood
Active immunity is obtained by
Which one of the following statements is correct?
$R.B.C.$ in adult are formed
Why is mother's milk considered the most appropriate food for a new born infant ?
Differentiate the following and give examples of each:
$(a)$ Innate and acquired immunity
$(b)$ Active and passive immunity