Question 6. Describe briefly the four major groups of Protozoa.

Answer: 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.