June 7, Protists are classified into three groups based on what? 2.Protozoans are classified into 4 groups based on what?

Contain photosynthetic pigments –Different pigments absorb different colors of light –So these protists can be found in many colors DO NOT contain roots, leaves, or other typical plant structures Classified based on –Type of pigment –How they store food –What their cell wall is made of Plant-Like Protists

Unicellular plant-like protists –Called phytoplankton Phylum Bacillariophyta: Diatoms – golden yellow Phylum Chrysophyta –Yellow-green and golden brown algae –May form colonies Unicellular Plant-Like Protists

Phylum Pyrrophyta: Dinoflagellates –Can be heterotrophic –Can be bioluminescent (give off light) –Spin as they move –Cause algal blooms: massive production of algae, suffocates fish and other marine life –Red tides: red dinoflagellates overpopulate, some could produce a lethal nerve toxin that can be held in shellfishRed tides Unicellular Plant-Like Protists

Phylum Euglenophyta –Characteristics of both plants and animals –Lack a cell wall –MOVEMENT: FlagellaFlagella –NUTRITION & DIGESTION: Heterotrophs and autotrophs Have chloroplasts for photosynthesis –Eyespot helps them move toward light In low light, they absorb nutrients from environment Some can use endocytosis to eat smaller protists/bacteria –WASTE: Contractile vacuole (also to maintain homeostasis) –REPRODUCTION: Asexual –FOUND IN: Mostly freshwater, some saltwater Unicellular Plant-Like Protists

Phylum Phaeophyta: brown algae –Multicellular, KelpKelp Phylum Chlorophyta: green algae –Most diverse group –Multi or unicellular Phylum Rhodophyta: red algae –Multicellular Plant-Like Protists

These organisms lack chlorophyll and absorb food through cell walls Their cell walls are not chitin (like in fungi) more like cellulose Decomposers! Slime mold Water Mold Fungus-like Protists

3 phyla: 1.Cellular Slime Mold – Phylum Acrasiomycota 2.Acellular Slime Molds – Phylum Myxomycota 3.Water Molds - Phylum Oomycota - Fungus-like Protists

Phylum Acrasiomycota Cellular Slime Molds Begin life cycle as amoeba-like cells When a cell begins to run out of moisture or food, it sends out chemical signals that attract other cells of the same species –Thousands of cells will aggregate into a large slug-like mass –This mass migrates for several centimeters and then stops to form a fruiting body with spores for reproduction

Phylum Acrasiomycota Cellular Slime Molds

Phylum Myxomycota Acellular Slime Molds Begin life cycles as amoeba-like cells that grow into large masses –mass is actually a single cell with thousands of nuclei

Phylum Myxomycota Acellular Slime Molds

Phylum Oomycota: Water Molds Most live in water but some live on land –Land water molds include parasites of crops like grapes, avocados and potatoes