Read the following statements carefully: (i) Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. (ii) Peyer's patches of the small intestine act as primary lymphoid organs. (iii) Both bone marrow and thymus provide micro-environments for the development and maturation of T-lymphocytes. (iv) MALT constitutes about 20 per cent of the lymphoid tissue in the human body. How ma

Step-by-step solution

Statement (i) is correct. The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced. Statement (ii) is incorrect. Peyer's patches of the small intestine are secondary lymphoid organs, which provide the sites for interaction of lymphocytes with the antigen. Statement (iii) is correct. Both bone marrow and thymus provide micro-environments for the development and maturation of T-lymphocytes. Statement (iv) is incorrect. Mucosa-Associated Lymphoid Tissue (MALT) constitutes abo