protists

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PROTISTS

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PROTISTS. Protists. Eukaryotes, not members of the kingdoms Plantae , Animalia , or Fungi Most unicellular but not all Protista = very first. Evolution of Protists. Symbiosis of several cells Mitochondria/chloroplasts live inside larger cells. Classification of Protists. - PowerPoint PPT Presentation

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Page 1: PROTISTS

PROTISTS

Page 2: PROTISTS

Protists Eukaryotes, not members of the

kingdoms Plantae, Animalia, or Fungi Most unicellular but not all Protista= very first

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Evolution of Protists Symbiosis of several cells Mitochondria/chloroplasts live inside

larger cells

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Classification of Protists Animal-like protists-obtain food like

heterotrophs

Plant-like protists- obtain food like autotrophs

Fungus-like protists- decomposers or parasites

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Phylums of Animal Like Protists

Zooflagellates Movement: use flagellum to move Food: Absorb food through cell

membrane Reproduction: asexually/sexually

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Sarcodines Movement: pseudopodsAmoeboid movement- cytoplasm streams

into pseudopod Food: pseudopods capture take into

food vacuole Reproduce: Mitosis/Cytokinesis

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Foraminiferans- SarcodineSecretes calcium carbonate

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Ciliates Movement: cilia propel Food: Cilia move food into gullet, force

food into food vacuole Waste material emptied when food

vacuole fuses with anal pore Contractile vacuoles- cavities

specialized to collect water

Ciliates= Paramecium

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Trichocysts- small bottle shaped structures used for defense

Danger= stiff projections that protect cell

Two nuclei› Macronucleus- keeps genes for day to day

use› Micronucleus- contains reserve copy of

cells genes

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Reproduction: asexually mitosis/cytokinesis

Conjugation- exchange genetic material

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Sporozoans Movement: not on their own/ parasitic Reproduction: sporozoites Diseases: malaria

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Plantlike Protists Algae 7 major phylums

› 4- unicellular› 3- multicellular

Use photosynthesis- › Chlorophyll a› Chlorophyll b› Chlorophyll c› Accessory pigments› Allow use of different light wavelengths

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Unicellular Plant like Protists

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Euglenophytes aka Euglena Movement: Two flagellum Pellicle- cell membrane Food: Eye spot- cluster of reddish

pigment for photosynthesis Can live as heterotrophs-absorb food Reproduce: Asexually- binary fission

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Chrysophytes Yellow/green algae and gold/brown

algae Have gold colored chloroplasts

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Diatoms Produce thin, delicate call walls rich in

silicon (component of glass) Cell walls – different patterns like

etched glass

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Dinoflagellates ½ photosynthetic ½ heterotrophic 2 flagellum Luminescent- shimmer when agitated

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Ecology of unicellular Algae Make up the base of aquatic food

chains Phytoplankton- ½ of photosynthesis on

earth

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Red Tide Protists release dangerous toxins Shell fish eat the protists = trap toxin Human eating shell fish become very

sick› Paralysis› death

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Multicellular Plant like Protists

1. Red algae- coral reefs2. Brown algae- Kelp3. Green algae

› Unicellular › Colonial (volvox)› Multicellular (ulva)

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Spirogyra- Green colonial algae› Live in water› Multicellular› Spiral shaped chloroplasts

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Fungus like Protists Heterotrophs/decomposers Slime molds or water molds Water molds responsible for the Irish

Great Potato Famine