Protists
This presentation is the property of its rightful owner.
Sponsored Links
1 / 26

PROTISTS PowerPoint PPT Presentation


  • 93 Views
  • Uploaded on
  • Presentation posted in: General

PROTISTS . Most diverse; 200,000 + species; wide variety of shapes, sizes, & colors; Unicellular (amoeba) & Multicellular (seaweed); All Eukaryotic; can be jellylike, rigid, or colonial; 3 groups: Protozoans Algae Fungus-Like. Protozoans.

Download Presentation

PROTISTS

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Protists

PROTISTS


Protists

Most diverse; 200,000 + species; wide variety of shapes, sizes, & colors; Unicellular (amoeba) & Multicellular (seaweed); All Eukaryotic; can be jellylike, rigid, or colonial; 3 groups:

  • Protozoans

  • Algae

  • Fungus-Like


Protozoans

Protozoans

Animal-like protists –unicellular heterotrophs that feed on other organisms or dead organic matter; Grouped based on movement; 4 types


Sporozoans

Sporozoans

  • Parasitic (nonmotile)

  • Produce spores

  • ExamplePlasmodium falciparum

    (causes Malaria)


Amoebas

Amoebas

  • Pseudopodia for movement

  • Blob-like

  • Most marine (few freshwater—oozes, wet moss, & moist soil)

  • Asexual Reproduction

  • 2 types:

    • Foraminiferans – calcium carbonate shells

    • Radiolarians – silica shells


Protists

Single-parent produces 1 or more identical offspring; this is called __________________


Flagellates

Flagellates

  • Move by whipping flagella from side

    to side

  • Parasitic

  • Examples

    • In termite intestines

    • Giardia lamblia(causes giardiasis = water-borne diarrhea)


Ciliates

Ciliates

  • Move by beating cilia

  • Most complex Protozoans

  • Example

    • Paramecia


Algae

Algae

  • Plant-like Protists

  • Photosynthetic

  • Unicellular & multicellular species

  • Produce more than ½ the Earth’s oxygen

  • 6 Phyla


Euglenoids

Euglenoids

  • Unicellular; Aquatic w/traits of plants & animals

  • Most have chlorophyll (photosynthesis)

  • Move by using 1 or 2 flagella

  • Autotrophic or heterotrophic

  • Euglena sp.

Phacusacuminatus


Diatoms

Diatoms

  • Golden Algae; Unicellular w/ Silica shells

  • Shaped like a pillbox

  • Photosynthetic Autotrophs

  • Marine & some freshwater

  • Asexual & sexual reproduction

  • Contain chlorophyll & carotenoids


Diatom reproduction

Diatom Reproduction

  • Asexual – box splits & each half make new half

  • Sexual -- gametes


Dinoflagellate

Dinoflagellate

  • Spinning Algae

  • Unicellular; thick cellulose plates in cell walls

  • 2 flagella (causes spinning)

  • Most marine; some bioluminescent

  • Contain chlorophyll, carotenoids, red pigments

  • Toxins – red tides – can be lethal– harvesting of shellfish banned


Red algae

Red Algae

  • Red Seaweed

  • Multicellular; chlorophyll & phycobilins (red & blue pigments)

  • Marine Tropical or Cool Rocky Coasts


Brown algae

Brown Algae

  • Kelp; many w/air bladders to keep afloat near surface

  • Multicellular

  • Contain chlorophyll, yellowish-brown carotenoid (fucoxanthin)


Green algae

Green Algae

  • Unicellular & Multicellular & Colonial (seaweed Volvox colony hollow ball made of 100’s of flagellated cells in single layer)

  • Chlorophyll & some have yellow pigments


Protists

  • Mostly freshwater; others in oceans, moist soil, tree trunks, snow, & in fur of sloths

  • Sexual & asexual reproduction (fragmentation)


Fungus like protists

Fungus-like Protists

  • Multicellular

  • Form delicate, net-like structures on surfaces of food supplies

  • 3 Phyla


Slime molds

Slime Molds

  • Colorful (yellow/orange to blue, violet, jet black

  • Animal-like = engulf food like amoebas

  • Reproduce by spores

  • 2 main types: Plasmodial & Cellular


Plasmodial slime molds

Plasmodial Slime Molds

  • Form plasmodium for movement & for reproduction

  • Moves by amoeboid action (creeps along)

  • Forming netlike structure on surfaces of decaying logs/leaves

  • Multiple nuclei

  • Spore reproduction in dry

    conditions


Cellular slime molds

Cellular Slime Molds

  • Food plentiful – individual haploid, amoeboid

  • Food scarce – form multicellular mass w/distinct cell membranes

  • Divide by regular cellular division

  • Tend to be microscopic


Water molds downy mildews

Water Molds & Downy Mildews

  • Live in water or moist places

  • Decomposers & parasites


Water molds

Water Molds

  • Look like fuzzy, white growths on decaying matter

  • Grow as mass of threads

  • Produce flagellated reproductive cells


Downy mildews

Downy Mildews

  • Parasitize plants

  • Some cause plant diseases


  • Login