Antigen is a substance which
lowers body temperature
destroys harmful bacteria
triggers the immune system
is used as an antidote to poison
The term ’active immunity' means
Give scientific reasons : Autoimmune diseases are different from immune deficiency diseases.
$A$ - The vaccines generate memory - $B$ and $T$ - cells. $R$ - In vaccination activated pathogens are introduced into the body.
Match the columns :
Column - $I$ | Column - $II$ |
$(a)$ Physical barrier | $(1)$ skin |
$(b)$ Physiological barrier | $(2)$ interferon protein |
$(c)$ Cellular barrier | $(3)$ leucocytes |
$(d)$ Cytokine barrier | $(4)$ Saliva in the mouth |
Transplantation of tissues/organs fails often due to nonacceptance by the patient’s body. Which type of immune response is responsible for such rejections?