(a) Thymus is one of the primary lymphoid organ of the immune system. The lymphocytes mature in the thymus. T- cells produced in the bone marrow get matured in the thymus and are released from here.
(b) T- cells are the cells produced by the thymus gland. T- cells do not produce antibodies by themselves, but help B- cells to produce them. The T- cells are also responsible for cell - mediated immune response (CMI).