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Protists

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  1. Protists Chapter 2 Lesson 3

  2. Protists A. Eukaryotes that cannot be classified as animals, plants or fungi B. A diverse group • Most are unicellular • Some are large, simple multicellular • Some are heterotrophs • Some are autotrophs • Some are both heterotrophic & autotrophic • Some can move • Some cannot move • All live in moist environments

  3. What are the characteristics of Animal-like Protists ? A. Like animals: • Heterotrophic • Most can move B. Unlike animals: • Unicellular C. Sarcodines • Move with pseudopods ‘false foot’ • Slow moving via the cytoplasm flowing in a direction using the pseudopod and then the rest of the body follows • Ex. Amoeba • http://www.youtube.com/watch?v=iRQTY_9Yekc

  4. D. Flagelattes • Protozoans that use one or more long whiplike flagella to move • Ex. Giardia • http://www.youtube.com/watch?v=-yIHkq9R5_c E. Ciliates • Use hundreds of hairlike projections, cilia, to move and feed • Ex. Paramecium • http://www.youtube.com/watch?v=fh_yjLppNAg F. Spore-forming parasitic protists • Feed on the body fluids of their hosts • Most depend on a host for transportation (ex. Mosquito) • Ex. Plasmodium causes malaria

  5. What are the characteristics of Plant-Like protists(Algae) ? A. Like Plants: • Autotrophs that use photosynthesis & produce much of the world’s oxygen • Can be multicellular B. Unlike Plants: • Can be unicellular • Lack true leaves, stems and roots • Some can move and some are heterotrophic in addition to autotrophic C. Euglenoids • Unicellular algae that can act as heterotrophs in the absence of sunlight • Eyespot used to detect light • Flagella that allows movement • http://www.youtube.com/watch?v=fI7nEWUjk3A

  6. D. Dinoflagellates • Unicellular • Flagella • Multicolor and some glow in the dark • http://www.youtube.com/watch?v=EN1Yxq8KMsw E. Diatoms • Unicellular • Glass-like cell walls • Move by oozing along a slime released from the cell wall • Form diatomaceous earth used in household products like Soft Scrub and some toothpastes

  7. F. Red Algae • Multicellular seaweed • Can grow deep underwater because of it’s ability to absorb even a small amount of light (~260m) • Nutrient rich food and is used in ice cream (makes it smoother) and hair conditioner G. Brown Algae • Most seaweed • The most plant-like in structure of the plant-like protists • Edible and sometimes used as thickeners in puddings and other foods

  8. What are the characteristics of Fungus-like protists? A. Like Fungus: • Heterotrophs • Cell walls • Reproduce with spores B. Unlike Fungus: • Are able to move at some point in their life C. Slime Molds • Brilliantly colored • Unicellular or multicellular D. Water Molds & Downy Mildews • Live in wet places • Attack crops (ex. Irish potato famine 1845 & 1846)