Class 12 NEET Biology Human Health and Diseases Questions Part 2

The correct answer is option no. (1) as both statements I and II are correct.
In humans, the bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.
Both bone-marrow and thymus provide micro-environments for the development and maturation of T-lymphocytes.
Options (2), (3) and (4) are incorrect.