EVERYDAY SCIENCE

Detailed explanation-1: -Hence, practically there is no death of unicellular organisms rather they are divided into their new generation cells i.e. daughter cells.

Detailed explanation-2: -Protozoa cause some common and some uncommon infections. Some of these infections cause illness in millions of people each year; other diseases are rare.

Detailed explanation-3: -Malaria. Malaria is the most significant of the protozoan parasites that infect man. Found in tropical and sub-tropical regions of the world, malaria parasites threaten the lives of 3.3 billion and cause ∼0.6–1.1 million deaths annually (Fig.

Detailed explanation-4: -Protozoal infection results in tissue damage leading to disease. In chronic infections the tissue damage is often due to an immune response to the parasite and/or to host antigens as well as to changes in cytokine profiles. Alternatively, it may be due to toxic protozoal products and/or to mechanical damage.