Protists
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Protists

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Protists Protists Presentation Transcript

  • Characteristics Protists are usually unicellular eukaryotic organisms. They live anywhere near a water body such as the ocean, lakes, swamps, etc. Multicellular protists dont have specialized tissues. They have nucleus and complex organelles Protist kingdom is made by any organism that didnt qualify to be animal, plant, or fungi. Exp: Amoeba, Euglena, Slime molds.
  • Nutrition Some protists such as flagellates feed by filtrating their water in order obtain food. Animal like protists expand their cell membrane around their prey forming a food vacuole and them “eat them” using endocytosis. Plant like protists are autotrophs, so they use photosynthesis in order to feed. Fungi like protists consume dead or decomposing matter.
  • Reproduction Protists reproduce both sexually and asexually by binary fission. Some species like the plasmodium have a more complex life cycle in which the can reproduce sexually and asexually.Growth Cells grow like bacteria and archae, except that it takes a longer to finish due the complexity of it.
  • Classification Chromalveolata: Some of them have cell walls, can do photosynthesis or have other similarities to plants. Alveolata: Alveolata group is known for havinf cortical alveoli and flattened vesicles. Excavata: Excavates dont have a regular have mitochondria. Usually the have more than two flagella. The closest example of excavata to multicellularism is the slime mold.
  •  Rhizaria: Many have shell which makes up many of protist fossils. Arcaeplastida: Not all are prosists, only rhodophyta and glaucophyta. Unikonta: Not all are prosists, only Amebozoa and Choanozoa. This group features organisms such as amoebas
  • Pros and Cons Pros: Protists serve as food in the sea environment such as diatoms that form plankton (one of fish main food sources) which makes them a very important part of the underwater ecosystem. Cons: Some protists such as plasmodium can cause malaria, and the african typanosomiasis causes “sleeping sickness” that can lead to coma or death.
  • References http://en.wikipedia.org/wiki/Protist http://plantphys.info/organismal/lechtml/protista.sht ml http://www.youtube.com/watch?v=-zsdYOgTbOk