AIIMS 2018 Zoology Immune System MCQ Question
Assertion : Monocytes constitute only 6-8% of WBCs but are very essential
Reason : These are phagocytic cells.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not correct explanation of A
A is true but R is false
A and R are false
Correct Answer
Detailed Explanation
Phagocytosis is the primary function of monocytes, as it involves the engulfing and digestion of foreign particles, such as bacteria and dead cells, thereby playing a crucial role in the immune response. In contrast, antibody production (B) is primarily associated with B lymphocytes, histamine release (C) is linked to mast cells and basophils in allergic reactions, and antigen presentation (D) is mainly performed by dendritic cells and macrophages, which are derived from monocytes but serve a different function in activating T cells. Understanding these distinctions highlights the specialized roles of different leukocytes in the immune system.
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