NEET BIOLOGY

Detailed explanation-1: -Protozoans exhibit diverse modes of locomotion across the various groups, but the modes of locomotion can be broadly divided into flagellar, ciliary, and amoeboid movement. Only the ciliates among the three major motility groups of protozoans, however, represent a truly monophyletic group (or single evolutionary line).

Detailed explanation-2: -Historically protozoa were divided into four major groups: the ameba, the flagellates, the ciliates, and the sporozoa. The distinguishing features between the groups was based on motility (i.e., ameboid, flagella, cilia).

Detailed explanation-3: -On the basis of light and electron microscopic morphology, the protozoa are currently classified into six phyla. Most species causing human disease are members of the phyla Sacromastigophora and Apicomplexa.

Detailed explanation-4: -The locomotory organs of protozoa are cilia, flagella and pseudopodia. Cilia are the hair-like short cell organelle extending from the cell surface. Cilia bearing protozoan is Paramecium.

Detailed explanation-5: -The correct option is B-locomotory organelles.