Animal-like Protists and Funguslike Protists. Before we begin…some review What does the term...
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Transcript of Animal-like Protists and Funguslike Protists. Before we begin…some review What does the term...
Before we begin…some review
• What does the term “eukaryotic” mean?• What does the term “heterotroph” mean?• What does the term “autotroph” mean?• What is the difference between “unicellular”
and “multicellular”?
What is a Protist?
• Diverse kingdom – sometimes called “junk drawer kingdom”
• Are all eukaryotes• All live in moist environments• Mix of unicellular and multicellular • Mix of autotrophs and heterotrophs• Most have contractile vaculoes – pump water
out of the organism
Grouping Protists
• Protists are classified into three groups:– Animal-like protists– Funguslike protists– Plant-like protists
Animal-like Protists
• Also called protozoans• All heterotrophs• All unicellular
• Divided into four groups– Protozoans with Pseudopods– Protozoans with Cilia– Protozoans with Flagella– Others
Protozoans with Pseudopods
• These protists are called sarcodines.• They all have pseudopds that allow them to
move and trap food.– Pseudopod – “false foot”; temporary bulge of the
cell membrane that fills with cytoplasm
• Example – Our old friend, the amoeba
Protozoans with Cilia
• These protists are called ciliates.• They all have cilia that allow them to move,
obtain food, and sense the environment.– Cilia – hairlike projections from a cell that move in
a wavelike pattern.
• Example – paramecium
Protozoans with Flagella
• These protists are called zooflagellates.• They all have flagella that help them move.– Flagella – long, whiplike tail
• Many live in symbiosis in other organisms.– Symbiosis – interaction between two species
• Example - Giardia
Other Protozoans
• These are called sporozoans.• They are all parasites that feed on the cells
and body fluids of their hosts.
• Example – Plasmodium, causes malaria
Funguslike Protists
• Have cell walls• Use spores to reproduce• Are heterotrophs
• Three types:– Water molds– Downy mildews– Slime molds
Water Molds and Downy Mildews
• Live in water and moist places• Grow as tiny threads that look fuzzy
• Can also attack food crops– Water mold destroyed potato crops in 1845-1846
and caused the Irish Potato Famine that killed over a million people!
Water Molds and Downy Mildew
Water mold growing on a fish.It is a parasite that will eventually kill the fish. Downy mildew growing on lettuce.