NEETZoologyHuman Health and Diseases
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Lymph nodes and spleen are considered secondary lymphoid organs. Reason (R): They provide the micro-environments for the development and maturation of B-lymphocytes and T-lymphocytes. In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is false but (R) is true
- D(A) is true but (R) is false
Correct answer
D. (A) is true but (R) is false
Step-by-step solution
Assertion (A) is true because lymph nodes and spleen are indeed secondary lymphoid organs. Reason (R) is false because the development and maturation of B-lymphocytes and T-lymphocytes occur in the primary lymphoid organs, which are the bone marrow and thymus. Secondary lymphoid organs, such as lymph nodes and spleen, provide the sites for the interaction of lymphocytes with the antigen, not for their maturation. Answer: (A) is true but (R) is false