Question

Match List - I with List - II. List - I List - II
A. Part of the solid portion of the blood that oxygenates the cells of the body I. Antibody
B. Part of the solid portion of the blood that fights infection II. Antigen
C. Substance found on the outside surface of a red blood cell III. Leukocytes
D. Substance found in the plasma of the blood that reacts with an antigen IV. Red blood cells
Choose the correct answer from the options given below :

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

Hint:

RBC → Oxygen, WBC → Defense, Antigen → On RBC surface, Antibody → Plasma reaction.

Answer 1

The Correct Option is A

Concept: Blood is composed of cellular elements and plasma proteins, each having specific roles in oxygen transport, immunity, and antigen-antibody reactions.

Step 1: Understanding Red Blood Cells (A).
Red blood cells (RBCs) contain hemoglobin and are responsible for transporting oxygen to body tissues.
Thus, A $\rightarrow$ IV.

Step 2: Understanding Leukocytes (B).
Leukocytes or white blood cells are responsible for defending the body against infections and foreign invaders.
Thus, B $\rightarrow$ III.

Step 3: Understanding Antigens (C).
Antigens are substances present on the surface of red blood cells that determine blood groups (e.g., ABO system).
Thus, C $\rightarrow$ II.

Step 4: Understanding Antibodies (D).
Antibodies are proteins present in plasma that react specifically with antigens to neutralize them.
Thus, D $\rightarrow$ I.

Step 5: Forming correct combination.
\[ A-IV,\quad B-III,\quad C-II,\quad D-I \] Final Conclusion:
Hence, the correct answer is option (1).