I) The causative organism of malaria is a protozoan parasite.

b)

i) The causative organism of malaria is a protozoan parasite.

• Plasmodium species (e.g., Plasmodium falciparum, Plasmodium vivax)

ii) Four ways of controlling the incidence of malaria in a community are:

• Using insecticide-treated bed nets to prevent mosquito bites.
• Draining stagnant water and clearing bushes to eliminate mosquito breeding sites.
• Spraying insecticides (e.g., indoor residual spraying) to kill adult mosquitoes.
• Taking antimalarial drugs for prevention (prophylaxis) or treatment.