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Biology - Chp 20 - Protists - PowerPoint

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  • 1. Protists Chapter 20 Protists
  • 2. What is a Protist?
    • The kingdom Protista is a diverse group that may include more than 200,000 species
    • Biologists have argued for years over the best way to classify protists, and the issue may never be settled
    • In fact, protists are defined less by what they are and more by what they are not
  • 3. Protist
    • Eukaryotes that are not members of the kingdoms Plantae, Animal, or Fungi
    • Most protists are unicellular, but some are multicellular
  • 4. Endosymbiotic theory
    • Theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms
  • 5. Evolution of Protists
    • The kingdom “Protista” means “the very first” which is appropriate because they were the first eukaryotic organism on Earth
    • It is hypothesized that the first Protists evolved from a symbiosis of several prokaryotic cells
  • 6. Endosymbiotic theory
  • 7. Endosymbiotic theory
  • 8. Endosymbiotic theory
  • 9. Classification of Protists
    • Protists are so diverse that biologists suggest that they should be broken up into several kingdoms
    • Currently biologists don’t agree how this should be done
    • Therefore we will look at Protists as if they belong in the same kingdom and classify them by how they obtain nutrition
  • 10. Heterotrophs
    • Can’t make their own food
    • Many are capable of locomotion (moving)
  • 11. Animal-like Protists
  • 12. Flagellates
  • 13. Cilliates
  • 14. Sarcodines
  • 15. Sporozoans
  • 16. Malaria
  • 17. Plant-like Protists
    • Many protists contain the green pigment chlorophyll and carry out photosynthesis
    • Autotrophic
    • However, they are not classified as plants, they are algae
  • 18. Euglena
  • 19. Volvox
  • 20. Diatoms
  • 21. Dinoflagellates
  • 22. Ecology of Unicellular Algae
    • Plant-like protists play a major ecological role on earth
    • They make up a large part of the phytoplankton
  • 23. Phytoplankton
    • The population of small photosynthetic organisms near the surface of the ocean
    • About 1/2 of photosynthesis on earth occurs in phytoplankton
  • 24. Phytoplankton
  • 25. Green algae
  • 26. Red Algae
  • 27. Algal Blooms
    • Sometimes populations of algae grows in enormous masses called blooms
    • These algal blooms deplete the water of nutrients and can release toxins into the water
    • Ex.) Red tide
  • 28. Red tide
  • 29.  
  • 30.  
  • 31. Fungus-like Protist
    • Like fungi, the fungus-like protist are heterotrophs that absorb nutrients from dead or decaying organic matter
    • But unlike true fungi, fungus-like protists have centrioles
    • They also lack the chitin cell walls of true fungi
  • 32. Slime molds
    • Slime molds are fungus-like protists that play a key role in recycling organic material
    • Found in places that are damp and rich in organic matter
  • 33.  
  • 34. Water Molds
    • Fungus-like protists that thrive on dead decaying organic matter in water and some are plant parasites on land
  • 35. Ecology of Fungus-like Protists
    • They are important as recyclers or organic material
    • They can cause diseases however
      • Mildews and blights
      • Potato famine 1845 and 1851
  • 36.  
  • 37.  
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