PROTISTS Diatoms

Commonalities / Differences in the Protist Kingdom All are eukaryotes (cells with nuclei). Live in moist surroundings. Unicellular or multicellular. Autotrophs, heterotrophs, or both. Some can move - others cannot.

3 categories of Protists Animal-like Fungus-like Plant-like

Animal-like Protists (Protozoans) *Unicellular *Consumers *Groups based on movement: flagella, cilia, pseudopods

Protozoans with pseudopods Pseudopods also called ‘false feet’ Cytoplasm flows this allows the protozoan to move, dragging the rest of the cell behind it.

Can form 2 pseudopods to surround & trap food. Food vacuole forms to break down food. Pseudopods, cont.

Example of a protozoa that uses pseudopods – Amoeba

Protozoans with cilia Cilia - hair like structures - help organisms move, get food and sense environment. Oral groove lined with cilia - moves food into food vacuole at end of oral groove.

Example of protozoan w/ cilia: Paramecium.

Protozoans with flagella Use long whip like “tail” called flagella to move.

Example of a protozoa with flagella Giardia Found in contaminated water and can cause severe diarrhea

Other Protozoans Some protozoans are parasites Feed on cells & body fluids of hosts Plasmodium (causes malaria) have more than 1 host: mosquitoes and then humans

Fungus like Protists Decomposers Produce spore (seed like structures) have cell walls of chitin Not in fungi kingdom because they can move at one point in their lives.

Fungus-like Protists example Slime mold

Plantlike Protists Producers unicellular to very large multicellular Contain different pigments so they come in different colors. Green cholorphyll is common

Euglena: special type of algae - when there is no sunlight they become consumers Plantlike Protists Flagella

Plant-like Protists example Volvox Diatoms Euglena Dinoflagellates Kelp-a.k.a. Seaweed