Four major groups of Protozoa is as follows: (a) Amoeboid Protozoa: They are found in fresh water, sea water or moist soil. They have pseudopodia like amoeba, hence the name amoeboid protozoa. (b) Flagellated Protozoans: They have flagella for movement. They are either free living or parasitic. (c) Ciliated Protozoans: They have thousands of cilia present all over the body. The cilia helps in locomotion and steering of food into the gullet. (d) Sporozoans: Many protozoans have an infectious spore-like stage in the life cycle. The spore-like stage helps them get transferred from one host to another host