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...
PROTISTS
CHAPTER 19
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
ORIGIN OF
PROTISTS
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
Spirogyra
Volvox
Mixed green algae
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
SLIME MOLD
PROTOZOA (singular: protozoan)
Animal-like protists
All are unicellular heterotrophs
Move by means of cilia, flagella, pseudopodia
Reproduce asexually (some sexually)
Some are parasiticsporozoans
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
FLAGELLATES
Protozoans with one or more flagella
Some are parasiticAfrican Sleeping Sickness
CILIATESProtozoans with cilia
Salt or fresh water
Includes:Paramecium
Vorticella
Stentor
SPOROZOANS
Parasitic protozoansMalaria
Sleeping sickness
Trichimonas
Most produce sporesReproductive cell
Produces a new organism
Plasmodium (causes Malaria)
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
WATER MOLD
ALGAEPhotosynthesizing protistsFresh or salt waterContain chlorophyllProduce more than half the earth’s oxygenInclude:
Red algaeGreen algaeBrown algaeDiatoms - contain silicaEuglenoidsDinoflagellates DIATOMS
RED ALGAE BROWN ALGAE
DIATOMS
Dinoflagellates: known as “fire algae” (cause red tides)