Ncert Exercises & Solutions

Q. 26 Where are B-cells and T-cells formed? How do they differ from each other?

Both type of lymphocytes and other cells of the immune system are produced in the bone marrow.

B and T-cells are different from each other in the following aspects

B-lymphocytes (B-cell) T-lymphocytes (T-cell)

They mature in bone They mature in thyrnus

marrow. gland

They produce antibody They directly attack the

against antigen. antigen or attach B-cells to
produce antibody.

They do not respond to They respond to organ

organ transplantation, transplantation