Question

Match List I with List - II.

List - I	List - II
A. Macrophages	I. Secrete cytokines (interleukins)
B. B-lymphocytes (B-cells)	II. Gaseous-exchange
C. Helper T-cells	III. Ingest large particles and cells by phagocytosis
D. Reticulocytes	IV. Produce and secrete antibodies

Choose the correct answer from the options given below:

• A. A-III, B-IV, C-I, D-II \
• B. A-I, B-II, C-IV, D-II \
• C. A-II, B-I, C-III, D-IV \
• D. A-IV, B-II, C-III, D-I

Hint:

B-cells are the body's antibody factories (B-IV). Reticulocytes are young red blood cells, which links them directly to oxygen transport and gas exchange (D-II).

Answer 1

The Correct Option is A

Step 1: Concept Different cell lineages in hematopoiesis differentiate into specialized cells, with some driving innate and adaptive immune responses and others handling gas transport.

Step 2: Meaning Matching these specialized blood and immune cells with their primary physiological functions.

Step 3: Analysis * Macrophages (A) are innate immune phagocytes that patrol tissues to engulf and digest pathogens, cellular debris, and foreign particles $\rightarrow$ (A-III). * B-lymphocytes (B) differentiate into plasma cells that manufacture and secrete antigen-specific antibodies to drive humoral immunity $\rightarrow$ (B-IV). * Helper T-cells (C) express CD4 surface markers and coordinate the broader adaptive immune response by secreting chemical signaling proteins like interleukins and cytokines $\rightarrow$ (C-I). * Reticulocytes (D) are immature, newly formed red blood cells that carry hemoglobin throughout the bloodstream to manage gas exchange ($\text{O}_{2}$ and $\text{CO}_{2}$) $\rightarrow$ (D-II).

Step 4: Conclusion The correct matching combination is A-III, B-IV, C-I, D-II, corresponding to option A. Final Answer: (A)