Protists
Protists are single or multi-celled organismsThat live in wet environments.
They have eukaryotic cells
They reproduce asexually.
The biggest difference between protists is how they get food.
Protists can be:
1. Animal-like (get food from outside source)
2. Plant-like (make own food)
3. Fungus-like (digest decayed material)
Animal-like Protists are known as protozoa.
They live in many different places. Some are parasites, which means that they live on orin another organism.
Animal-like protists are put into different groups based on how they move.
A. Rhizopods- move using pseudopods, which are arm-like extensions of their cytoplasm
Ex. Amoeba
An amoeba may never have the same shapetwice!
B. Flagellates - move using a whip-like tailcalled a flagella
Ex. - Trypanosoma
Flagellates may have one or more flagella.
C. Ciliates - move by waving short, hair-likestructures called cilia
Ex.- Paramecium
D. Sporozoans - have no way of moving on their own, so they are parasites that livein and feed on animal blood; can be disease-causing
Ex.- malaria
Plant-like Protists all make their own food usingsunlight.
They are green because they contain Chlorophyll.
The process of making their own food is calledPhotosynthesis.
Plant-like protists are known as algae.
Plant-like Protists are grouped by how theystore food and by color.
A. Euglenas -1. Have an “eyespot” that is light sensitive2. Can make or get food3. Most move with flagella4. One-celled
B.Diatoms - 1. Make own food 2. One-celled 3. Store food as oil 4. Covered by a shell
C. Dinoflagellates -1. Move in a spinning motion2. Store food as starch and oil3. Live in saltwater
D. Green Algae -1. One or many celled2. Stores food as starch3. Live in many environments
E. Red Algae -1. Most are many-celled2. Used as a “thickener” in products
F. Brown Algae -1. Many-celled2. People eat this
Fungus-like Protists get energy bydecomposing dead or decaying materials.
A. Slime molds -1. Can move using pseudopods2. Live in moist, shady places
B. Water molds and Mildew -Grow as a mass of threads over theorganism they are feeding on