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Which of these is not a secondary lymphoid organ?(a) Lymph nodes(b) Tonsils(c) Spleen(d) ThymusThe question was asked in a national level competition.Origin of the question is Animal Tissues-4 topic in portion Structural Organisations in Animals of Biology – Class 11

Answer»

Correct OPTION is (d) THYMUS

Explanation: Thymus and BONE MARROW are primary LYMPHOID organs. Lymph nodes, tonsils, and spleen are secondary lymphoid organs.



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