Protists The world of Protists: Animal-like Protists Plant-like Protists Fungus-like Protists.
Protists
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Kingdom Protista / Protoctista“Protists”
Presenters:
Dayna Bignal
Hortense Hassan
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Protists• Protists are a very large, diverse group of
organisms, including the plant-like protists (algae), fungi-like protists, and the animal-like protists (protozoans).
• Animal-like Protists – also called protozoa (means “first animal”) – heterotrophsPlant-like Protists – also called algae – autotrophsFungus-like Protists – heterotrophs, decomposers, external digestion
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DefinitionProtists are eukaryotic organisms that aren’t plants, animals or fungi, which mainly live in water.
Differences between plant-like and animal-like protists
Plant-like Animal-like
can photosynthesise Do not
maybe unicellular or *multicellular
unicellular
Feed on the sun Must feed on other living organisms
*The multicellular types have no real roots, stems, or leaves, just a simple body called a thallus
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Characteristics of Protists
• mostly unicellular, some are multicellular (algae)
• can be heterotrophic or autotrophic
• most live in water (though some live in moist soil or even the human body)
• ALL are eukaryotic (have a nucleus)
• No tissue
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Protists “phylogeny”
• Biological junk drawer
Classification of Protists
• how they obtain nutrition• how they move
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Locomotion
• Cilia - Microscopic hair like projections extending from the surface of a cell or unicellular organism. Capable of rhythmical motion, they act in unison to bring about the movement of the cell or of the surrounding medium
Paramecium
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• Flagella - A long, threadlike appendage, especially a whip like extension of certain cells or unicellular organisms, found singly or in pairs.
Euglena
Locomotion
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• Pseudopodia - A temporary projection of the cytoplasm of certain cells, such as phagocytes, or of certain unicellular organisms, especially amoebas.
Amoeba
Locomotion
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Metabolism • There are two major groups;
Phototrophic Organotrophic
Make their own food; Does not make their
generally from the sun own food; eat food to get energy
Kelp
Euglena
Dinoflagellate
plasmodium
Amoeba
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Reproduction • Asexual
• Sexual
• Both
Paramecium splitting in half
Slime mold (about 13 different genders)
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Diversity
• Paramecium – cilia around the outside
Volvox- Large colony of cells with a smallercolony inside it
kelp
Diatoms – converting silicon into glass at low temperature