NEET BIOLOGY

Detailed explanation-1: -Protozoa are microscopic unicellular eukaryotes that have a relatively complex internal structure and carry out complex metabolic activities. Some protozoa have structures for propulsion or other types of movement.

Detailed explanation-2: -Protozoans are also strictly non-multicellular and exist as either solitary cells or cell colonies. Nevertheless, some colonial organisms (e.g., Dictyostelium discoideum, supergroup Amoebozoa) exhibit high levels of cell specialization that border on multicellularity.

Detailed explanation-3: -Historically, protozoans were regarded as “one-celled animals", because they often possess animal-like behaviours, such as motility and predation, and lack a cell wall, as found in plants and many algae.

Detailed explanation-4: -Amoeba is a protozoan. They can be both unicellular and multicellular.

Detailed explanation-5: -Protozoa are unicellular eukaryotes. Examples: amoeba, euglena, paramecium.