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Kingdom Protista. Protists belong to the Kingdom Protista , which includes mostly unicellular organisms that live in moist environments. Characteristics of Protists. Mostly unicellular Muticellular are algae Are autotrophic or heterotrophic Some are both auto and heterotrophic

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Kingdom protista

Kingdom Protista

Protists belong to the Kingdom Protista, which includes mostly unicellular organisms that live in moist environments.


Characteristics of protists
Characteristics of Protists

  • Mostly unicellular

  • Muticellular are algae

  • Are autotrophic or heterotrophic

    • Some are both auto and heterotrophic

  • Most live in water, moist soil or in human body

  • Eukaryotic

  • A protist is an organism that is not a plant, animal or fungus


  • Protist means the very first

  • Classification of Protists

    • How they obtain nutrition

    • How they move


Types of protists
Types of Protists

  • Animal-like – protozoans (means first animal) are heterotrophic

  • Plant-like – algae are autotrophic

  • Fungus-like –hetertrophs, decompsers and have external digestion


Animal like protists
Animal-like Protists

  • Classified by how they move

  • Examples

  • Zooflagellates –flagella

  • Sacodines – pseudopods (cytoplasmic streaming)

  • Ciliates – cilia

  • Sprozoans – do not move


Zooflagellates
Zooflagellates

  • Move using one or two flagella

  • Absorb food across membrane

  • Example- trypanosoma (African Sleeping Sickness) or dinoflagellates - red tides


Sarcodines
Sarcodines

Reproduce by binary fission

Contains a contractile vacuole to remove excess water

Can cause disease – amebic dysentery- stomach upset

Example - Ameoba

  • Move using pseudopodia which are “false feet”- extensions of cytoplasm called ameboid movement

  • Ingests food through endocytosis, creating a food vacuole


Ciliates
Ciliates

  • Move using cilia

  • Has 2 nuclei – macro and micronucleus

  • Food enters through a mouth pore into a gullet

  • Anal pore removes wastes

  • Contractile vacuole

  • Exhibits avoidance behavior

  • Reproduces by both binary fission or conjugation

  • Cell membrane is called pellicle – rigid to keep shape

  • Example - Paramecium


Sporozoans
Sporozoans

  • Do not move on their own

  • Parasitic

  • Example – plasmodium which causes –

    • Malaria is a sporozoan that infects the liver and blood


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