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Kingdom Protista. Chapter 20. What is a protist? any organism that is not a plant, animal, fungus, or prokaryote. Domain Eukarya , Kingdom Protists Eukaryotic – HAVE A NUCLEUS Mostly unicellular Heterotrophic or autotrophic Aquatic or moist habitats. Animal-like Protists - Protozoans.

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What is a protist?

  • any organism that is not a plant, animal, fungus, or prokaryote.
  • Domain Eukarya, Kingdom Protists
    • Eukaryotic – HAVE A NUCLEUS
    • Mostly unicellular
    • Heterotrophic or autotrophic
    • Aquatic or moist habitats
animal like protists protozoans
Animal-like Protists - Protozoans
  • Heterotrophic
    • feed on bacteria, organic matter, other protozoans, and fungi
grouped according to movement
Grouped according to movement
  • Sarcodines – move by pseudopod
    • “false feet”
  • Ciliates – move with cilia
    • Tiny hair-like projections
  • Zooflagellates – move by flagella
    • Long whip-like structure
  • Sporozoans - parasitic
plant like protists
Plant-like Protists

Autotrophic – carry out photosynthesis

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Phytoplankton (small, unicellular algae found near the surface of bodies of water)

    • produce about 75% of the Earth’s oxygen
    • Basis of most aquatic food chains
slide7

Dinoflagellates

  • Red tides – increased nutrients cause protists to grow out of control
  • Some species produce a strong nerve toxin that gets into shellfish and can harm you if you eat it.
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Diatoms

  • cell walls made of silicon
  • used to make toothpaste abrasive and road paint
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Algae

  • used in sushi, ice cream, agar, deodorant, hair conditioner, salad dressing, pudding
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Fungus-like protists

  • decomposers, have cell walls, and reproduce by spores
  • slime molds, water molds, and mildew
  • Attack potatoes, cabbage, and corn
  • The Great Hunger was caused by this group of protists
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Diseases cause by Sporozoans:

  • Plasmodium—carried by Anopholesmosquito
    • causes malaria
  • Trypanosoma—carried by the tsetse fly
    • causes African sleeping sickness
  • Giardia, Entamoeba, Cryptosporidium
    • causesamoebic dysentery
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Toxoplasmagondii

    • Causes toxoplasmosis, can be contracted from an infected cat or poorly cooked meat. Harmful to a developing fetus.