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Protist ppt.ppt

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Protist ppt.ppt

  1. 1. Kingdom: Protista Protists are unicellular organisms that have a nucleus.
  2. 2. Similar to Bacteria  Unicellular  One of the first groups of living things on Earth. (1.5 billion years ago.)  Microscopic  Can cause disease.  Can be parasites
  3. 3. Difference from Bacteria  Has a nucleus.  Live in watery environment.  Generally live as individual cells.  Protists vary greatly in appearance and function.
  4. 4. 3 Categories  I. Animal-like Protists.  II. Plant-like Protists.  III. Fungus-like Protists.
  5. 5. I. Animal-like Protists  Protozoan means “First Animal”.  Cells contain a nucleus.  Cells lack a cell wall.  They are heterotrophs.  Most can move on their own.
  6. 6. 4 Groups of Animal-like Protists  1. Sarcodines (SAHR-koh-dighnz)  2. Ciliates (SIHL-ee-ihts)  3. Flagellates (FLAJ- ehl-ihts)  4. Sporozoans (spohr-oh-ZOH-uhnz)
  7. 7. 1. Sarcodines  Have pseudopods (Greek:“false foot”)  Extensions of the cell membrane and cytoplasm.  Pseudopods are used for movement and to capture food.  Many have shells.  These shells form limestone, marble and chalk.
  8. 8. One type:  Most familiar Sarcodine.  Pseudopods:  Blob shaped.  Contractile Vacuoles: controls amount of water inside  Food Vacuole: where food is digested.
  9. 9. Split Personality  Amebas reproduce by dividing into two new cells (binary fission).  Amebas can respond to their environment.  They are sensitive to light and some chemicals.
  10. 10. 2. Ciliates  Have cilia on the outside of their cells.  Tiny hair-like projections used for movement, to gather food and as feelers.
  11. 11. Type: Paramecium  Pellicle: tough outer wall.  Slipper shaped  Oral groove: like the mouth  Gullet: holds food.  Food Vacuole: digests food.  Anal Pore: removes wastes  2 Contractile Vacuoles  2 Nuclei  Reproduces by either binary fission or conjugation.
  12. 12. 3. Flagellates (Zooflagellates)  Have a Flagellum: a long whip-like structure used for movement.  Many live in animals  Symbiosis a close relationship, at least one benefits.  Mutualism: when both partners benefit.
  13. 13. 4. Sporozoans  All Sporozans are parasites.  They feed on cells and body fluids.  Form from Spores (tiny reproductive cells).  Pass from one host to another.  Pass from ticks, mosquitoes or other animals to humans.
  14. 14. II. Plant-like Protists (Algae)  Unicellular and Multicellular  Colonies (groups of unicellular protists)  Can move on their own  Autotrophs: make their own food from simple materials using light energy (photosynthesis).  70% of the Earth’s oxygen is produced by Plant-like Protists!  Pigments: chemicals that produce color
  15. 15. 6 Groups of Plant like Protists  Euglenoids (yoo-GLEE-noydz)  Diatoms (DIGH-ah-tahmz)  Dinoflagellates (digh-noh-FLAJ-eh-layts)  Red Algae  Green Algae  Brown Algae
  16. 16. 1. Euglenoids  Green  Unicellular  Live in fresh water  Autotrophs, but can be heterotrophs under certain conditions.  Flagella  Eyespot: sensitive to light.  Chloroplasts  Pellicle
  17. 17. 2. Diatoms  Unicellular  10,000 living species.  Aquatic  Glass like cell wall  Diatomaceous earth: course powder that comes from dead diatoms (toothpaste, car polish & reflective paint.
  18. 18. 3. Dinoflagellates  Unicellular  Cell walls are like plates of armor.  Two flagella  Spins when it moves.  Colorful (pigments)  Can glow in the dark.  Causes Red Tide
  19. 19. Red Algae  Multicellular seaweeds  Live in deep ocean waters  Used for ice cream and hair conditioner  Used as food in Asia
  20. 20. Green Algae  Most are unicellular  Some form colonies  Few are multicellular  Can live in fresh and salt water and on land in damp places.  Very closely related to green plants.
  21. 21. Brown Algae  Commonly called seaweed  Can contain brown, green, yellow, orange and black pigments.  Attach to rocks  Have air bladders  Giant Kelp can be 100 meters long!  Used as food thickeners
  22. 22. III. Fungus-like Protists  Heterotrophs  Have cell walls.  Many have flagella and are able to move at some point in their lives.  Three types: Slime Molds, Water & Downy Molds  Reproduce with Spores (tiny cell that is able to grow into a new organism)
  23. 23. Water & Downy Molds  Live in water or moist places.  Tiny threads that look like fuzz.  Attack food crops  Caused the Irish Potato Famine.
  24. 24. Type:  Reproduce by Fruiting Bodies:  The Fruiting Bodies contain Spores.  At first they look like ameba, then later they look like mold.  Live on moist shady places.  Feed on bacteria and other microorganisms.

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