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PROTISTS

PROTISTS. CHAPTER 19. KINGDOM PROTISTA (most diverse kingdom). All are eukaryotic Unicellular or multi-cellular Microscopic or very large Heterotrophic or autotrophic Plant-like, animal-like or fungus-like . ORIGIN OF PROTISTS. ALGAE. Plant-like protists Autotrophs

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PROTISTS

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  1. PROTISTS CHAPTER 19

  2. KINGDOM PROTISTA (most diverse kingdom) • All are eukaryotic • Unicellular or multi-cellular • Microscopic or very large • Heterotrophic or autotrophic • Plant-like, animal-like or fungus-like

  3. ORIGIN OF PROTISTS

  4. ALGAE • Plant-like protists • Autotrophs • Lack true leaves, roots and stems • Most are aquatic • Produce much of the earth’s oxygen • Basis of the aquatic food chain

  5. Spirogyra Volvox Mixed green algae

  6. FUNGAL PROTISTS • Unlike fungi, fungus-like protists are able to move and lack chitin in their cell walls. • Decompose dead materials (saprobes) • Make nutrients available to living organisms Slime molds

  7. SLIME MOLD

  8. PROTOZOA (singular: protozoan) • Animal-like protists • All are unicellular heterotrophs • Move by means of cilia, flagella, pseudopodia • Reproduce asexually (some sexually) • Some are parasitic • sporozoans

  9. AMOEBAS • Protozoans with pseudopodia • “False foot” • Extensions of cytoplasm • Aid in movement & feeding • Shapeless • Most live in salt water • Some have shells • Foraminiferans • radiolarians • Most reproduce asexually • Some form cysts • Survive unfavorable conditions

  10. FLAGELLATES • Protozoans with one or more flagella • Some are parasitic • African Sleeping Sickness

  11. CILIATES • Protozoans with cilia • Salt or fresh water • Includes: • Paramecium • Vorticella • Stentor

  12. SPOROZOANS • Parasitic protozoans • Malaria • Sleeping sickness • Trichimonas • Most produce spores • Reproductive cell • Produces a new organism Plasmodium (causes Malaria)

  13. FUNGUS-LIKE PROTISTS • Slime molds • Grow on rotting leaves or decaying tree stumps & logs • Water molds • Live in water or moist places • Appear as fuzzy, white growths • Downy mildews • Live in water or moist places • Cause plant diseases

  14. WATER MOLD

  15. DIATOMS ALGAE • Photosynthesizing protists • Fresh or salt water • Contain chlorophyll • Produce more than half the earth’s oxygen • Include: • Red algae • Green algae • Brown algae • Diatoms - contain silica • Euglenoids • Dinoflagellates

  16. RED ALGAE BROWN ALGAE

  17. DIATOMS

  18. Dinoflagellates: known as “fire algae” (cause red tides)

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