Question

The immune system plays an important role in

a. Recognition of foreign antigens
b. Responds to antigens and remembers them
c. Allergic reactions
d. Auto-immune diseases
e. Organ transplantation

• A. b, c and e
• B. a, b, c and d
• C. a, b, c, d and e
• D. a and b only

Answer 1

The correct option is C a, b, c, d and e

Immune system :
Immune system is a network of cells, tissues, organs, and the substances that protects the body from foreign invaders.

Major roles of immune system are as follows:
$1$. It recognizes antigens as non-self.
$2$. It retains the memory of the invading antigens and acts very fast during the subsequent encounter with the same antigen.
$3$. Allergy is the exaggerated response of the immune system of the body to certain antigens.
$4$. The condition of the body in which the body fails to differentiate between self and non-self cells and start attacking self cells is called autoimmunity. It is an immune system disorder.
$5$. It plays an important role in rejection of tissues during organ transplantation.

Final answer :
(d) a, b, c, d and e