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Protists

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

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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

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