(a) "Plasmodium protozoan needs both a mosquito and a human host for its continuity." Explain.

Sporozoites (infectious form of Plasmodium) enter in the blood of human

through female Anopheles mosquito's bite, sporozoites multiply asexually (asexual phase) in liver, Red Blood Cells (RBCs), and form gametocytes in RBCs of human host which are taken by female Anopheles mosquito with blood meal, fertilization and further development take place in the mosquito's gut leading to formation of sporozoites (sexual phase), that are stored in its salivary glands hence needs both host for its continuity.

Balanced diet, personal hygiene, regular exercise / yoga, vaccination, proper disposal of waste, control of vectors, maintenance of hygienic food and water.