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Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
Biology - Chp 20 - Protists - PowerPoint
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Biology - Chp 20 - Protists - PowerPoint

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  • 1. Chapter 20 Protists 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. 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
  • 30. 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
  • 31. Water Molds• Fungus-like protists that thrive on dead decaying organic matter in water and some are plant parasites on land
  • 32. 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

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