Observe the diagram and answer the following question.
The cell which help/stimulate other cell in producing the molecule shown in diagram is:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → T-lymphocytes
Option (1) B-lymphocytes — Incorrect. B-cells are the cells that make the antibody; the question asks which cell helps them.
Option (2) T-lymphocytes — Correct. The molecule shown is an antibody. Antibodies are made by B-cells, and T-lymphocytes (helper T-cells) do not secrete antibodies but help B-cells produce them.
Option (3) Neutrophils — Incorrect. Neutrophils are phagocytes of innate immunity; they engulf microbes and do not help in antibody production.
Option (4) Macrophages — Incorrect. Macrophages are also phagocytes, a cellular barrier of innate immunity.
NCERT Extract:
Acquired Immunity – “… The primary and secondary immune responses are carried out with the help of two special types of lymphocytes present in our blood, i.e., B-lymphocytes and T-lymphocytes. The B-lymphocytes produce an army of proteins in response to pathogens into our blood to fight with them. These proteins are called antibodies. The T-cells themselves do not secrete antibodies but help B cells to produce them.”