Question

Match the following \[ \begin{array}{|c|l|c|l|} \hline & List-I & & List-II \hline A & \text{Thymus} & I & \text{B-cell maturation} B & \text{Bone marrow} & II & \text{T-cell maturation} C & \text{Spleen} & III & \text{Blood filtration} D & \text{Lymph node} & IV & \text{Lymph filtration} \hline \end{array} \] The correct matching is

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

Hint:

Primary lymphoid organs: \[ \boxed{ \begin{aligned} \text{Bone marrow} &\rightarrow \text{B-cell maturation} \text{Thymus} &\rightarrow \text{T-cell maturation} \end{aligned} } \] Secondary lymphoid organs: \[ \boxed{ \begin{aligned} \text{Spleen} &\rightarrow \text{Filters blood} \text{Lymph node} &\rightarrow \text{Filters lymph} \end{aligned} } \]

Answer 1

The Correct Option is A

Step 1: Recall the functions of lymphoid organs. \[ \boxed{ \begin{aligned} \text{Thymus} &\rightarrow \text{T-cell maturation} \text{Bone marrow} &\rightarrow \text{B-cell maturation} \text{Spleen} &\rightarrow \text{Blood filtration} \text{Lymph node} &\rightarrow \text{Lymph filtration} \end{aligned} } \]

Step 2: Match List-I with List-II. Thus, \[ \boxed{ A-\mathrm{II},\; B-\mathrm{I},\; C-\mathrm{III},\; D-\mathrm{IV} } \] Therefore, \[ \boxed{(A)} \] is the correct answer.