chapter 20. what is a protist? any organism that is not a plant, animal, fungus, or prokaryote....
TRANSCRIPT
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
• Heterotrophic • feed on bacteria, organic matter, other
protozoans, and fungi
Animal-like Protists - Protozoans
Grouped according to movementSarcodines – move by pseudopod
“false feet”Ciliates – move with cilia
Tiny hair-like projectionsZooflagellates – move by flagella
Long whip-like structureSporozoans - parasitic
Plant-like ProtistsAutotrophic – carry out photosynthesis
•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
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.
Diatoms• cell walls made of silicon• used to make toothpaste
abrasive and road paint
Algae• used in sushi, ice cream, agar,
deodorant, hair conditioner, salad dressing, pudding
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
• Plasmodium—carried by Anopholes mosquito• causes malaria
• Trypanosoma—carried by the tsetse fly• causes African sleeping sickness
• Giardia, Entamoeba, Cryptosporidium• causes amoebic dysentery
Diseases cause by Sporozoans:
• Toxoplasma gondii• Causes toxoplasmosis, can be contracted from an infected cat or poorly cooked meat. Harmful to a developing fetus.