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Q.
Primary lymphoid organs of the human body are
NTA AbhyasNTA Abhyas 2022
Solution:
Immune system consist of lymphocytes organs, tissue, cells and soluble molecules. Lymphoid organ is the site which involves maturation and proliferation of immune cells takes place. Primary lymphoid organs includes $ \rightarrow $ Bone marrow and thymus, where lymphocytes undergo differentiation into cells which are sensitive to antigen.