Which of the following protozoa are known for being non-motile?

Plasmodium species are indeed recognized for their non-motile nature during their life cycle. They are intracellular parasites that cause diseases such as malaria. Plasmodium parasites primarily exist in the blood and within host liver cells and do not have the means to move independently; instead, they are transmitted through the bites of infected female Anopheles mosquitoes.

In contrast, the other listed protozoa, such as Entamoeba, Amoeba, and Trypanosoma, exhibit various forms of motility. For instance, Amoeba species move by extending pseudopodia, while Trypanosoma use flagella for movement. Entamoeba can also exhibit some form of motility when transitioning between environments, particularly within the intestines of its host. Thus, the distinctive feature of Plasmodium as non-motile within its life cycle underlines its classification compared to the motile counterparts in the list.