Protists
What is a Protist?
! “Junk drawer” Kingdom
! Eukaryotes
! Mostly Unicellular & Multicellular
! Autotrophic & Heterotrophic
What is a Protist?
Three Categories
! Animal-like
! Fungus-like
! Plant-like
Animal-like Protists ! Heterotrophs
! Called Protozoans
! Four types based on how they move or live
! Protozoans with Pseudopods
! Protozoans with Cilia
! Protozoans with Flagella
! Other Protozoans
Protozoans with Pseudopods
! Called Sarcodines
! Move with pseudopods (“false foot”)
! Have a contractile vacuole to expel extra water
! Example: Ameba
Protozoans with Pseudopods
Protozoans with Cilia
! Called Ciliates
! Move with cilia (hair like structures)
! Complex cells - two nuclei
! Asexual & sexual reproduction
! Example: Paramecium
Protozoans with Cilia
Protozoans with Flagella
! Called Zooflagellates
! Use Flagella to move (whip like structure)
! Symbiosis - interaction between two species where at least one species benefits
! Mutualism - both species benefit.
! Example: Giardia
Protozoans with Flagella
Other Protozoans
! Called Sporozoans
! Parasites – An organism that lives on or in a host and causes harm to the host
! Example: Plasmodium
Fungus-like Protists
! Heterotrophs (animal like)
! Cell wall (Plant like)
! Spores to reproduce
! Examples: Water Molds, Downy Mildews, Slime Molds
Plant-like Protists
! Commonly called algae
! Autotrophs
! Live: soil, bark of trees, fresh water, salt water
! Examples: Euglenoids, Dinoflagellates, Diatoms, Green Algae, Red Algae, Brown Algae
Plant-like Protists
Protists and Us
Helpful
! Food source to organisms
! Makes most of earths oxygen
! Toothpastes
! Household scouring products
! Swimming pool filters
! Insecticides
! Ice cream
! Hair conditioner
! Nutrient-rich delicacy
! Thickener for pudding and salad dressing
Protists and Us
Harmful
! Parasitic to humans
! Cause malaria
! Attack food crops