Question

Which of the following matches is correct?

	Structure	Percentage	Function
a		0.3 - 0.5	Phagocytic
b		0.5 - 1.0	Secrete histamine and serotonin
c		30 - 40	Defence against parasite
d		30 - 40	Allergic reactions

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

Answer: (B)

The figure in option (b) shows basophil, which is correct with its percentage and function as
Basophils are with lobed nucleus and few large granules.
They are involved in inflammatory reactions, thus secrete histamine, serotonin, etc. The other options are correctly explained as follows
- Neutrophils have multilobed nucleus and are $60-65\%$ of total WBCs. They are phagocytic in nature.
- Eosinophils have bilobed nucleus and are $2-3\%$ of total WBCs. They are involved in allergic reactions in the body.
- Monocytes have a $U$-shaped nucleus and are $6-8\%$ of total WBCs. They are also involved in phagocytic functions.