Sporozoan protozoa belong to the class Sporozoa, which is characterized by the presence of spore-forming stages in their life cycle. Plasmodium is a well-known example of sporozoan protozoa, and it is the causative agent of malaria in humans. It exhibits a complex life cycle involving both a vertebrate host (human) and an invertebrate vector (mosquito). Other options:
• Entamoeba: A type of amoeboid protozoa causing amoebiasis.
• Trypanosoma: A flagellate protozoan causing diseases like sleeping sickness.
• Paramaecium: A ciliate protozoan found in freshwater.
Thus, only Plasmodium qualifies as a sporozoan protozoa.