Question

Amoeba is a/an
(a) Mass of protoplasm
(b) Complete organism
(c) Acellular complete organism
(d) Incomplete cell

Answer 1

Hint: Amoeba is a highly motile, microscopic unicellular eukaryote that belongs to the group protozoa under kingdom Protista. They are heterotrophs ie., they feed on bacteria and other protists. They have a holozoic mode of nutrition. They move and capture prey by means of pseudopodia. They possess many characteristics as that of a unicellular eukaryote and hence they are complete organisms.

Complete answer: Although some protozoans are acellular, Amoeba is a highly motile, unicellular eukaryotic protozoa belonging to a type of amoeboid protozoan called Amoebozoa. They move and capture their prey through false feet called pseudopodia. They have no definite shape due to lack of skeleton. They are heterotrophs, they eat bacteria and other protists.
Their mode of nutrition is holozoic and possesses intracellular digestion. They possess contractile vacuole for excretion and mode of excretion is ammonotelic. They reproduce by binary fission. Most importantly, they have their own biochemical pathway.
Their cytoplasm and cellular contents are enclosed within a cell membrane.

Thus, they are complete organisms.

Note: Some biologists refer to amoeba as an acellular organism due to their polypoid nuclear system, sporulation, and behavior. However, they are single-celled whole groups of amoeboid eukaryotic protozoa, a complete organism belonging to kingdom Protista.