Assertion :Lymphocytes arise from bone marrow and present in the blood, lymph and connective tissues. Reason: Lymphocytes migrate to thymus, where they develop into T cells and begin to mature.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
A lymphocyte is one of the subtypes of white blood cell in vertebrates immune system. Lymphocytes include B cells, T cells, NK cells. Mammalian stem cells differentiate into several kinds of blood cell within the bone marrow. This process is called hematopoiesis. B cells mature into B lymphocytes in the bursa equivalent, while T cells migrate and mature in a distinct organ called thymus.

So the correct answer is "Both assertion and reason are correct but reason is not the correct explanation of the assertion".

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