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Protists

Protists. Protist Characteristics. An extremely diverse group Eukaryotes Mostly unicellular some colonial some multicellular Some heterotrophic, some autotrophic, some both Some have cell walls. 3 Major Types. Animal-like protozoa Fungus-like Plant- like algae.

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Protists

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  1. Protists

  2. Protist Characteristics • An extremely diverse group • Eukaryotes • Mostly unicellular • some colonial • some multicellular • Some heterotrophic, some autotrophic, some both • Some have cell walls

  3. 3 Major Types • Animal-like • protozoa • Fungus-like • Plant- like • algae

  4. “Animal-Like” Protists Protozoans Are heterotrophs (some are parasites!) Types of protozoans: 1. sarcodines 2. ciliaphore 3. flagellates 4. sporozoans

  5. Protist Phyla 1. Sarcodines– use pseudopodia (“false feet”) to move and get food EX: Amoebas, foraminifera. radiolarians

  6. http://www.funsci.com/fun3_en/protists/exhibition.htm • Amoeba change forms continuously

  7. 2. Ciliophores – use cillia to move EX: paramecium

  8. http://www.funsci.com/fun3_en/protists/exhibition.htm • Paramecia • http://ebiomedia.com/gall/ciliates/index.html - more ciliates

  9. 3. Flagellates-have whip-like flagella

  10. This one is a pathogen – causes diarrhea EX: Giardia

  11. Dinoflagellates have 2 flagella

  12. A related protist, Leishmania, causes the disease leishmaniasis. These protists are transmitted by biting flies, and are a serious public health problem in much of the world.

  13. Leishamanasis

  14. 4. Sporozoans – no method of movement form spores, many are parasites EX: - Toxoplasma- carried by rodents, birds, and domestic cats (can be harmful to unborn babies if mom changes the kitty litter box) - Plasmodium- causes Malaria (carried by mosquitoes)

  15. Life Cycle of Malaria

  16. “Plant-like” protists Are autotrophs Mostly algae Are classified by their pigments (their color) – red, green or brown Many are multicelled Do not have stems, leaves and roots like plants Make up phytoplankton (bottom of ocean food chain)

  17. Plant like protists

  18. 1. Green Algae • Are green in color • Ex – Spirogyra

  19. Spirogyra • http://www.funsci.com/fun3_en/protists/exhibition.htm

  20. Desmid- unicellular green algae

  21. Green algae - Volvox

  22. Green algae - HaematococcusTurns birdbath red

  23. 2. Red Algae • Multicellular • Commonly called sea weed • Live in deep salt water • Are used by humans to help make ice cream and hair conditioner • Are eaten in some Asian cultures

  24. 3. Brown Algae • Multicellular • Commonly called sea weed • Thallus- plant-like seaweed body • Holdfast- root-like; anchors to surface • Stipe- stem-like • Blades- leaf-like • Have air-filled sacs called air bladders • Used in many foods and beauty products

  25. Diatoms • Photosynthetic protists • Mostly marine • Have silica (glass-like) shell • Used to make reflective paint, toothpaste, and abrasives

  26. “Fungus-Like” Protists Slime & water molds Some of these can move Many are decomposers or parasites

  27. Slime molds

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