Question

descended from the cytotoxic t cells and are responsible for memory in cellular immunity are called t cells.

Explanation:

In cellular immunity, memory T cells are descended from cytotoxic T cells and are responsible for the memory aspect, allowing a quicker response upon re - exposure to an antigen. Specifically, the type of T cells descended from cytotoxic T cells and responsible for memory in cellular immunity are memory T cells (more precisely, memory cytotoxic T cells, but the key term here is "memory").

Answer:

memory