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Published byJerome Cummings Modified over 9 years ago
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Ch 20: Kingdom Protista Very diverse group Catch all - membership is determined mainly by exclusion from the other kingdoms
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Eukaryotes all Eukaryotes that are not plants, animals or fungus Mostly single celled, some multicelled, some colonial Classified by the way they obtain nutrition
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Autotrophic or Heterotrophic Animal Like Plant Like Fungus Like
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Autotrophic or Heterotrophic Plant Like - Autrotrophs Fungus Like - Heterotrophs –obtain food by external digestion (decomposers or parasites)
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Animal Like Protists Protozoans Heterotrophs 4 Phyla divided by the way they move
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Zooflagellates Unicellular Swim using flagella (1 or 2) Absorb food through cell membranes Most Reproduce asexually (Binary Fission)
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Zooflagellates Include several parasites that cause human diseases Examples: Giardia
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Sarcodines Unicellular Move with Pseudopods –temporary projections of cytoplasm Food vacuoles, Endocytosis Reproduce asexually (BF)
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Sarcodines Examples: –Amoeba (A. Dysentery) –Foraminiferans & Radiolarians (calcium carbonate) –Heliozoans (silica)
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Amoeba
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Ciliates Unicellular Move & feed with cilia Free living - not parasitic Reproduce by conjugation (sexual - pg 500) Most numerous and diverse group
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Ciliates Example: Paramecium (Anatomy page 499)
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Paramecium
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Sporozoans Unicellular Do not move on their own All parasitic Reproduce by means of sporozites - sexual and asexual phases (pg 501)
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Sporozoans Example: Malaria –Plasmodium vivax
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Plant Like Protists 7major phylas Unicellular & Multicellular Algae
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Plant Like Protists Unicellular Algae 4 major phylas Base of the food chain (phytoplankton - Algae & Protozoan)
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Euglenophytes Plant like - has chloroplast, Autotrophic Animal like - has 2 flagella, no cell walls (pellicle), eye spot (reacts to light), can be heterotrophic in low light Reproduces by BF
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Euglenophytes Euglena: page 506
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Dinoflagellates Half are photosynthetic, half are heterotrophic Have 2 flagella Reproduce by BF Many are luminescent (fire plants - red tide)
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Chrysophytes Yellow-green & Golden brown algae Gold colored Chloroplasts Cell walls with pectin Store food as oil rather than starch
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Diatoms Cell walls with silicon Fit together like a petri dish Remains of the cell are used in abrasives (diatomaceous earth)
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Plant Like Protists Multicellular Algae 3 major phylas Classified by pigments
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Red Algae Reddish accessory pigments Can live deeper in the ocean than most other Algae Complex life cycles Example: Irish Moss
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Brown Algae Brown accessory pigments Largest, most complex algae Have some specialized parts (Air Bladders, Blades, Hold Fasts, Stipes) Example: Giant Kelp
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Green Algae Phylum Chlorophyta Cellulose in cell walls Some are Unicellular Live in both fresh water and salt water
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Green Algae Example: –Volvox –Spirogyra (colonial) –Sea lettuce (multicellular)
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Fungus Like Protists Heterotrophic Absorb nutrients from dead or decaying organic matter 2 groups
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Slime Molds Have a 3 stage life cycle Shiny wet appearance, texture like gelatin Examples: Red Raspberry & Scrambled Egg Slime Mold
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Water Mold Oomycota Thrive on dead or decaying organic material in water Are plant parasites on land Produce Hyphae and zoosporangia
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Water Mold Life Cycle page 519 Example: –Phytophthora infestans (potato famine)
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Diseases caused by Algae African Sleeping Sickness Giardia Amoebic Dysentery Malaria
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Human Uses for Algae Seaweed, agar, algin Thickeners for ice cream & salad dressing plastics, waxes, deodorant
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