Answer:
T cell activation : proliferation
Explanation:
<u>The pairs that are correctly matched are:</u>
<u>Helper T cell: Killing of Virus infected cells
</u>
Helper T cells are also known as cytotoxic T cells which destroys cells with infected virus and tumor.
<u>
Plasma cell: Antibody Secretion
</u>
Plasma cell is also known as white blood cell. The cells are present in the bone marrow and secrete proteins called antibodies.
<u>
Effector B cell: Plasma cell
</u>
Plasma B cells are also known as Effector B cells.
Taking about,
<u>T cell activation : proliferation</u>
T cells are a type of lymphocytes that develops in the thymus gland. It is plays a central role in immune response. Thus, both T cell activation and proliferation are the different steps in the immune response by the T cell.
<u>Thus, they are mismatched.</u>