1a) General characteristics of Protists: protists can be divided into three groups:
Animal-like protists: heterotrophs and have the ability to move.
Plant-like protists: autotrophs ( do photosynthesis).
Fungi-like protists: heterotrophs
Reproduction can be done mainly by binary fission.
b)
| general characteristics | natural habitat | mode of nutrition | reproduction | ecological roles | |
| Euglena | unicellular organisms, presence of flagella | fresh and marine water | autotroph | Binary fission | photosynthesis |
| Triconympha | bell-shaped cell, presence of flagella and operculum. | hindgut of lower termites and wood roaches | Holophytic | asexually mainly, but some species reproduce sexually | sugar metabolism and nitrogen fixation |
| Trypanosoma | paraxial rod in the flagellum | rivers and lakes | heteroxenous | binary fission | causes African sleeping sickness, Chagas disease |
| Paramecia | cilia | freshwater, brackish, and marine environments | heterotrophs | binary fission | clean up small particles of debris in the water as well as feeding small animals. |
| Stentor | trumpet shape, rapid contraction, ciliate,and extension of the cell body | freshwater | heterotrophs | binary fission | Stentor can eat anything like bacteria, and also live symbiotically with green algae (Chlorella), algae feed stentor metabolic waste |
| Vorticella | stalked ciliate with an inverted bell shape, myoneme | soil, mud and plant root | omnivorous | binary fission | feed on bacteria and can also form extracellular associations with mosquitoes, nematodes, prawns, and tadpoles |
| Balantidium coli | sausage-shaped, Two visible nuclei | cecum and colon of humans, pigs, rats, and other mammals | heterotrophic | asexual binary fission or sexual conjugation | causes the infection called balantidiasis |
| Radiolaria | produce intricate mineral skeletons | marine | heterotrophic | Binary fission, multiple fission, and budding | have symbiotic relationship with algae, provide ammonium and carbon dioxide for the dinoflagellate symbionts |
| Foraminefera | pseudopods | marine(in the deep sea) | mixotrophic | asexually or sexually | turnover of nutrients and energy in the sea |
| Amoeba | consist of a single cell, jellylike cytoplasm | freshwater | holozoic nutrition | binary fission | regulate soil bacterial populations |
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