Question

Assertion : Interaction of lymphocytes and antigens occur in the secondary lymphoid organs.
Reason : Thymus and bone marrow provides the microenvironment for the lymphocytes to interact with the antigen.

• A. Both assertion and reason are true and the reason is the correct explanation of the assertion
• B. Both the assertion and reason are true but the reason is not the correct explanation of the assertion
• C. Assertion is true but the reason is false
• D. Both the assertion and reason are false

Answer 1

The correct option is C Assertion is true but the reason is false

Lymphoid organs are certain organs or tissues in which lymphocytes can differentiate and proliferate. They are part of the lymphatic system and of two types as follows:

Primary lymphoid organs are the centers of the immune system where lymphocyte development and maturation occur. Examples include thymus and bone marrow, they provide the microenvironment required for the development and maturation of lymphocytes.


Secondary lymphoid organs are sites where mature lymphocytes can interact effectively with the antigen and immune response can be launched. Examples include spleen, lymph node etc.

Thus the assertion is true but the reason is false.