Which is the main lymphoid organ where all blood cells, including lymphocytes, are produced?
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Bone marrow
Lymphoid organs are the organs where lymphocytes arise, mature and multiply. The primary lymphoid organs are the bone marrow and the thymus. Of these, the bone marrow is the main lymphoid organ: all blood cells, including lymphocytes, are produced there. The thymus, spleen and lymph nodes do not produce all blood cells.
NCERT Extract:
Immune System in the Body – “… The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. The thymus is a lobed organ located near the heart and beneath the breastbone. … Both bone-marrow and thymus provide micro-environments for the development and maturation of T-lymphocytes.”