Question
Given below are two statements:
Statement 1 : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.
Statement II: Both bone marrow and thymus provide micro environments for the development and maturation of T-lymphocytes.
In the light of above statements, choose the most appropriate answer from the options given below :
Options
Solution
Sol. [Key Concept: Primary lymphoid organs]
Both statements are accepted as correct in NCERT, so option (3) is retained. Bone marrow produces blood cells, including lymphoid precursors. T cell precursors arise in bone marrow and migrate to the thymus for their principal maturation and selection. The two organs therefore contribute at different stages; this does not mean that complete T cell maturation normally occurs independently in both.
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