Chapter  20     Protists          Protists
What is a Protist?• The kingdom Protista is a diverse  group that may include more than  200,000 species• Biologists have ...
Protist• Eukaryotes that are not members  of the kingdoms Plantae, Animal,  or Fungi• Most protists are unicellular, but  ...
Endosymbiotic theory• Theory that eukaryotic cells  formed from a symbiosis among  several different prokaryotic  organisms
Evolution of Protists• The kingdom “Protista” means  “the very first” which is  appropriate because they were  the first e...
Endosymbiotic theory
Endosymbiotic theory
Endosymbiotic theory
Classification of Protists• Protists are so diverse that biologists  suggest that they should be broken  up into several k...
Heterotrophs• Can’t make their own food• Many are capable of locomotion  (moving)
Animal-like Protists
Flagellates
Cilliates
Sarcodines
Sporozoans
Malaria
Plant-like Protists• Many protists contain the green  pigment chlorophyll and carry out  photosynthesis• Autotrophic• Howe...
Euglena
Volvox
Diatoms
Dinoflagellates
Ecology of Unicellular Algae• Plant-like protists play a major  ecological role on earth• They make up a large part of the...
Phytoplankton• The population of small  photosynthetic organisms near  the surface of the ocean• About 1/2 of photosynthes...
Phytoplankton
Green algae
Red Algae
Algal Blooms• Sometimes populations of algae  grows in enormous masses called  blooms• These algal blooms deplete the  wat...
Red tide
Fungus-like Protist• Like fungi, the fungus-like protist  are heterotrophs that absorb  nutrients from dead or decaying  o...
Slime molds• Slime molds are fungus-like  protists that play a key role in  recycling organic material• Found in places th...
Water Molds• Fungus-like protists that thrive on  dead decaying organic matter in  water and some are plant  parasites on ...
Ecology of Fungus-like Protists• They are important as  recyclers or organic material• They can cause diseases  however  –...
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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Biology - Chp 20 - Protists - PowerPoint

  1. 1. Chapter 20 Protists Protists
  2. 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. 3. Protist• Eukaryotes that are not members of the kingdoms Plantae, Animal, or Fungi• Most protists are unicellular, but some are multicellular
  4. 4. Endosymbiotic theory• Theory that eukaryotic cells formed from a symbiosis among several different prokaryotic organisms
  5. 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. 6. Endosymbiotic theory
  7. 7. Endosymbiotic theory
  8. 8. Endosymbiotic theory
  9. 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. 10. Heterotrophs• Can’t make their own food• Many are capable of locomotion (moving)
  11. 11. Animal-like Protists
  12. 12. Flagellates
  13. 13. Cilliates
  14. 14. Sarcodines
  15. 15. Sporozoans
  16. 16. Malaria
  17. 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. 18. Euglena
  19. 19. Volvox
  20. 20. Diatoms
  21. 21. Dinoflagellates
  22. 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. 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. 24. Phytoplankton
  25. 25. Green algae
  26. 26. Red Algae
  27. 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. 28. Red tide
  29. 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. 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. 31. Water Molds• Fungus-like protists that thrive on dead decaying organic matter in water and some are plant parasites on land
  32. 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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