Answer:
T cell activation : proliferation
Step-by-step explanation:
The pairs that are correctly matched are:
Helper T cell: Killing of Virus infected cells
Helper T cells are also known as cytotoxic T cells which destroys cells with infected virus and tumor.
Plasma cell: Antibody Secretion
Plasma cell is also known as white blood cell. The cells are present in the bone marrow and secrete proteins called antibodies.
Effector B cell: Plasma cell
Plasma B cells are also known as Effector B cells.
Taking about,
T cell activation : proliferation
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.
Thus, they are mismatched.