Thymus
(ii) Spleen
(iii) Appendix
(iv) MALT
(v) Bone marrow How many of the above are secondary lymphoid organs except?

Spleen and MALT are primary/secondary lymphoid organs.

In the following question a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as : Assertion (A): Bone marrow and thymus are primary lymphoid organs. Reason(R): It is the organs, to which matured lymphocytes migrate, interact with antigens and then proliferate to become effector cells.

Assertion : The priamary lymphoid organs are bone marrow and tonsils. Reason : Secondary lymphoid organs are spleen , lymphnodes thymus Peyer's patches of small intestine and appendix.

Which of the following statements are correct? (I) Bone marrow and spleen are primary lymphoid organs. (II) Mucosa Associated lymphoid Tissue (MALT) forms about 50% of the lymphoid tissue (III) MHC are the molecules reponsible for recognition and labelling. (IV) Innate immunity shows primary and secondary response. Codes

[A]: Lymphocytes develop in lymphoid tissue and involved in cell mediated and humoral immunity. [R]: Lymphocytes are produced in primary lymphoid tissue (thymus, embryonic liver and adult bone marrow) and migrate to secondary lymphoid tissue (spleen and lymph nodes)

[A]: Lymphocytes develop in lymphoid tissue and involved in cell mediated and humeral immunity. [R]: Lymphocytes are produced in primary lymphoid tissue (thymus, embryonic liver and adult bone narrow) and migrate to secondary lymphoid tissue (spleen and lymphnodes)

[A]: Lymphocytes develop in lymphoid tissue and involved in cell mediated and humeral immunity. [R]: Lymphocytes are produced in primary lymphoid tissue (thymus, embryonic liver and adult bone narrow) and migrate to secondary lymphoid tissue (spleen and lymphnodes)

[A]: Lymphocytes develop in lymphoid tissue and involved in cell mediated and humeral immunity. [R]: Lymphocytes are produced in primary lymphoid tissue (thymus, embryonic liver and adult bone narrow) and migrate to secondary lymphoid tissue (spleen and lymphnodes)