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Ch. 21 Protists

Ch. 21 Protists. Section 2 Groups of Protists Pg 501. Key Ideas. Why is it useful to group protists based on their methods of obtaining nutrition? What characteristic do animal-like protists share? What key characteristic do plantlike protists share?

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Ch. 21 Protists

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  1. Ch. 21 Protists Section 2 Groups of Protists Pg 501

  2. Key Ideas • Why is it useful to group protists based on their methods of obtaining nutrition? • What characteristic do animal-like protists share? • What key characteristic do plantlike protists share? • What characteristics makes funguslike protists similar to fungi?

  3. Grouping protists • How they obtain nutrition • Photosynthesis • Like plants • Eating other organisms • Animals • Absorb nutrients • Fungi • Protists are not related to any of these • There will be exceptions

  4. Animal like • Protozoa • Heterotrophic • Unicellular • Mobile • Most Reproduce asexually • Binary fission

  5. Animal like cont. • Ameboid protists • Pseudopodia • Cytoplasm extension used to capture food and for movement

  6. Animal like cont.

  7. Animal like cont.

  8. Animal like cont. • Ciliates • Covered in Cilia • Hairlike structures used for movement • Sexual reproduction by conjugation

  9. Animal like cont.

  10. Animal like cont. • Flagellates • One or many flagella • Whip like structure • Sporozoans • Form spore like cells in reproduction • No flagella, cilia, or pseudopods (don’t move) • All cause disease

  11. Plantlike protists • Phytoplankton and Algae • Diatoms • Unicellular • Double shells • Silica or calcium carbonate • Reproduce asexually • Euglenoids • Freshwater • 1 or 2 flagella • Photosynthetic and heterotrophic

  12. Plantlike protists cont. • Dinoflagellates • Unicellular • 2 flagella • Cellulose coats • Become encrusted with silica • Red Algae • Multicellular • Absorb blue light • Able to live in deeper water

  13. Plantlike protists cont. • Brown Algae • Multicellular • Cool ocean • Kelp • Can reach 60m long • Green Algae • Photosynthetic pigment • Starch • Cellulose cell wall

  14. Funguslike Protists • Reproduce by releasing spores • Slime Molds • Form plasmodium if lack of food or water • Mass of cytoplasm that has many nuclei • If it dries it can divide and form spores • Water molds and downy mildews • Multicellular filaments • Decompose dead organisms • Parasites • 1846 Irish potato famine

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