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Protists PowerPoint Presentation

Protists

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Protists

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  1. Protists

  2. Kingdom Protista • Most protists are unicellular organisms • Few are multicellular • All protists are eukaryotes • Eukaryotes have cellular organelles and prokaryotes (bacteria) do not.

  3. Kingdom Protista • Most unicellular protists are microscopic. • The large multicellularprotists are types of algae, organisms that are similar to plants via photosynthesis • However plant-like protists differ from plants because they lack plant features such as roots and stems

  4. Kingdom Protists • Some protists are described as animal-like. • Do not make their own food and can move independently • Most are single celled • Lack certain specialized cells, such as muscle cells, tissues, and organs.

  5. Movement • Classified by the 3 ways they move • Cilia – tiny beating hair-like structures • Flagellum – whip like tail (back and forth motion) • Pseudopodia – projection of cytoplasm that sticks out like a foot (false foot)

  6. Euglena (yoo-glee-nuh) • Unicelluar • Has characteristics of both plants and animals • Move freely and feed on other organisms • Makes its own food and also obtains nutrients by feeding as well. • Has an eyespot (to see) • When an eyespot detects light it uses flagellum to move toward the light so that its chloroplast can carry out photosynthesis

  7. Amoeba • Just visible to the naked eye • Unicellular • Moves by pseudopodia • Use pseudopods for feeding by surrounding it. • Aquatic – lives in ponds, ditches, or slowly moving streams. • Obtain nutrition by feeding on other animals

  8. Paramecium • Unicellular, slipper shaped • Aquatic - common in ponds and slow moving streams • Almost completely covered by cilia and uses that for movement • Feeds with the help of a structure called an oral groove – where food is drawn in by external and internal cilia to form a food vacuole.

  9. Volvox • Unicellular protists that has chloroplasts that can carry out photosynthesis • Does not live alone • Forms groups called colonies • Two small flagella that are used to move them • Cells near the surface are specialized to move the entire colony through water • Food source – makes its nutrients. • Example is algae