Protista Su10 - Protista Chapter 20 Protists Not a true...

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Protista Chapter 20
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Protists Not a true evolutionary unit united by shared features Term means: ~60,000 protist species Most are single-celled
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Diverse Modes of Reproduction Most reproduce asexually Many capable of sexual reproduction Non-reproductive combination
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Nutrition Photosynthetic Predatory protists Parasitic protists
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1. Chromist Water molds Diatoms Brown algae
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Water Molds Important impact on humans Shaped as long filaments Many are decomposers Some have profound economic impact Downy Mildew on grapes
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Diatoms Photosynthetic: Protective shell Slightly abrasive substance Play important ecological role: Marine phytoplankton accounts for nearly 70% of all photosynthetic activity on Earth Absorbs carbon dioxide
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Brown Algae Dominant in cool coastal waters Seaweed are multicellular aggregations Named for brownish- yellow pigment All are marine Gas filled floats Giant kelp
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2. Alveolates
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Protista Su10 - Protista Chapter 20 Protists Not a true...

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