PROTISTS CHAPTER 19. KINGDOM PROTISTA (most diverse kingdom) All are eukaryotic Unicellular or...
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Transcript of PROTISTS CHAPTER 19. KINGDOM PROTISTA (most diverse kingdom) All are eukaryotic Unicellular or...
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PROTISTS
CHAPTER 19
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KINGDOM PROTISTA (most diverse kingdom)
All are eukaryotic
Unicellular or multi-cellular
Microscopic or very large
Heterotrophic or autotrophic
Plant-like, animal-like or fungus-like
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ORIGIN OF
PROTISTS
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ALGAEPlant-like protists
Autotrophs Lack true leaves, roots and stems
Most are aquatic
Produce much of the earth’s oxygen
Basis of the aquatic food chain
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Spirogyra
Volvox
Mixed green algae
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FUNGAL PROTISTSUnlike fungi, fungus-like protists are able to move and lack chitin in their cell walls.
Decompose dead materials (saprobes)
Make nutrients available to living organismsSlime molds
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SLIME MOLD
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PROTOZOA (singular: protozoan)
Animal-like protists
All are unicellular heterotrophs
Move by means of cilia, flagella, pseudopodia
Reproduce asexually (some sexually)
Some are parasiticsporozoans
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AMOEBASProtozoans with pseudopodia
“False foot”
Extensions of cytoplasm
Aid in movement & feeding
Shapeless
Most live in salt water
Some have shellsForaminiferans
radiolarians
Most reproduce asexually
Some form cystsSurvive unfavorable conditions
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FLAGELLATES
Protozoans with one or more flagella
Some are parasiticAfrican Sleeping Sickness
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CILIATESProtozoans with cilia
Salt or fresh water
Includes:Paramecium
Vorticella
Stentor
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SPOROZOANS
Parasitic protozoansMalaria
Sleeping sickness
Trichimonas
Most produce sporesReproductive cell
Produces a new organism
Plasmodium (causes Malaria)
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FUNGUS-LIKE PROTISTSSlime molds
Grow on rotting leaves or decaying tree stumps & logs
Water moldsLive in water or moist places
Appear as fuzzy, white growths
Downy mildewsLive in water or moist places
Cause plant diseases
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WATER MOLD
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ALGAEPhotosynthesizing protistsFresh or salt waterContain chlorophyllProduce more than half the earth’s oxygenInclude:
Red algaeGreen algaeBrown algaeDiatoms - contain silicaEuglenoidsDinoflagellates DIATOMS
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RED ALGAE BROWN ALGAE
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DIATOMS
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Dinoflagellates: known as “fire algae” (cause red tides)