question_answer

Cell - mediated immunity plays an important role in organ transplantation. Explain.

Or

Diagrammatically trace the life cycle of a malarial parasite.

Answer:

Cell, mediated immunity is mediated by T, lymphocytes. It plays an important role in organ transplantation and is responsible for body's ability to differentiate between 'self and 'non, self tissues/organs.

There are two groups of T, lymphocytes which are responsible for cell, mediated immunity

(i) Cytotoxic/Killer T, Cells These cells kill the specific target cells by a variety of mechanisms.

(ii) Helper T, Cells These cells activate the specific B, cells to produce antibodies.

Thus, cell , mediated immunity plays an important role in organ transplantation.

Or

Life cycle of Plasmodium (malarial parasite) is given in the figure.