Draw a well labelled diagram to show the Life cycle of Plasmodium .

Plasmodium is a Protozoan parasite that involves two hosts in its life history. The primary host in which the sexual phase occurs is an Anopheles mosquito and the secondary host in which the asexual phase completes is man. The life cycle of this parasite has been shown below:

Give one significant difference between primary lymphoid organs and secondary lymphoid organs. Give one example of each.

Feature Primary lymphoid organ Secondary lymphoid organ Function and Example The primary lymphoid organs are the site where lymphocytes are produced and mature. Example: Bone marrow and Thymus Secondary lymphoid organs provide the sites for the interaction of a specific WBC called lymphocytes with antigen. Example: Spleen and Lymph nodes

Explain two characteristics of cancer cells.

The cancer cells exhibit the following characteristics: The cancer cells grow and divide at an abnormally rapid rate. The cancer cells are poorly differentiated, and have abnormal membranes, cytoskeletal proteins, and morphology.