protists
DESCRIPTION
PROTISTS. Diatoms. Commonalities / Differences in the Protist Kingdom. All are eukaryotes (cells with nuclei). Live in moist surroundings. Unicellular or multicellular. Autotrophs, heterotrophs, or both. Some can move - others cannot. 3 categories of Protists. Animal-like . Fungus-like. - PowerPoint PPT PresentationTRANSCRIPT
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PROTISTS
Diatoms
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Commonalities / Differences in the Protist Kingdom
• All are eukaryotes (cells with nuclei).• Live in moist surroundings.• Unicellular or multicellular.• Autotrophs, heterotrophs, or both.• Some can move - others cannot.
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3 categories of Protists•Animal-like
•Fungus-like
•Plant-like
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Animal-like Protists (Protozoans)*Unicellular *Consumers
*Groups based on movement: flagella, cilia, pseudopods
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Protozoans with pseudopods• Pseudopods also called
‘false feet’ • Cytoplasm flows this allows the protozoan to move, dragging the rest of the cell behind it.
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Can form 2 pseudopods to surround & trap food. Food vacuole forms to break down food.
Pseudopods, cont.
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• Example of a protozoa that uses pseudopods –
• Amoeba
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Protozoans with cilia
• Cilia - hair like structures - help organisms move, get food and sense environment.
• Oral groove lined with cilia - moves food into food vacuole at end of oral groove.
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• Example of protozoan w/ cilia: • Paramecium.
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Protozoans with flagella
• Use long whip like “tail” called flagella to move.
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Example of a protozoa with flagella Giardia
Found in contaminated water and can cause severe diarrhea
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Other Protozoans• Some protozoans are parasites • Feed on cells & body fluids of hosts
Plasmodium (causes malaria) have more than 1 host: mosquitoes and then humans
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Fungus like Protists
• Decomposers• Produce spore (seed like structures)
• have cell walls of chitin • Not in fungi kingdom
because they can move at one point in their lives.
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•Fungus-like Protists exampleSlime mold
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Plantlike Protists
• Producers• unicellular to very large multicellular• Contain different pigments so they come
in different colors. Green cholorphyll is common
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• Euglena: • special type of algae -
when there is no sunlight they become consumers
Plantlike Protists
Flagella
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Plant-like Protists example
Volvox
Diatoms
EuglenaDinoflagellates
Kelp-a.k.a. Seaweed