NEETZoologyBody Fluids and Circulation
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Bone marrow and thymus are classified as primary lymphoid organs. Reason (R) : In bone marrow and thymus, immature lymphocytes differentiate into antigen-sensitive lymphocytes. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Both Assertion (A) and Reason (R) are correct, and (R) is the correct explanation of (A). The defining characteristic of primary lymphoid organs is that they are the sites where immature lymphocytes differentiate into antigen-sensitive lymphocytes. In humans, the bone marrow and thymus serve this exact function, which is the reason they are classified as primary lymphoid organs. After maturation, these antigen-sensitive lymphocytes migrate to secondary lymphoid organs. Answer: Both (A) and (R) are correct and (R) i