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Kingdom Protista. Chapter 19. Kingdom Protista is extremely diverse Multicellular, unicellular, microscopic, large, autotrophic and heterotrophic Animal-like protists are called protozoans Heterotrophic and unicellular Plant-like protists are called algae Photosynthetic autotrophs.

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Kingdom Protista is extremely diverse

  • Multicellular, unicellular, microscopic, large, autotrophic and heterotrophic
  • Animal-like protists are called protozoans
    • Heterotrophic and unicellular
  • Plant-like protists are called algae
    • Photosynthetic autotrophs
slide3

Protozoan Diversity

  • Phylum Rhizopoda
    • Amoebas and amoeba-like organisms
    • Use pseudopods (extensions of cytoplasm) to eat and move
    • Live in fresh and salt-water
    • Most use asexual reproduction
  • Phylum Zoomastigina
    • Flagellates  move using flagella
    • Some are parasites that cause disease
slide4

Phylum Ciliophora

    • Ciliates  move using cilia
      • Paramecium
    • Live in every aquatic habitat
    • Reproduce sexually and asexually
  • Phylum Sporozoa
    • Sporozoans produce spores
    • All disease causing parasites
      • Malaria
slide5

Algal Diversity

  • Phylum Euglenophyta
    • Unicellular, aquatic; have both animal and plant-like characteristics
    • Move using flagella
  • Phylum Bacillariophyta
    • Diatoms
    • Have shells made of silica
    • Reproduce both sexually and asexually
    • Their shells are used in toothpaste, metal polishers and abrasives
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Phylum Dinoflagellata

    • Dinoflagellates have two flagella
    • Mostly marine
  • Phylum Rhodophyta
    • Red algae
    • Multicellular marine seaweed
    • No roots; use structures called holdfasts to hold to rocks
  • Phylum Phaetophyta
    • Brown algae  kelp
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Phylum Chlorophyta

    • Green algae
    • Unicellular, multicellular, or colonial
    • Asexual reproduction  fragmentation
    • Use alternation of generations
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Alternation of generations

  • Life cycle found in plants using both diploid and haploid organisms
    • Gametophyte haploid (n), produces gametes (sex cells)
    • Sporophyte diploid (2n), formed from the fusion of two haploid gametes
      • Produce spores through meiosis that are haploid and develop into a gametophyte
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Fungus-like protists

  • Slime molds  colorful, live in cool moist areas
  • Phylum Myxomycota
    • Plasmodial slime molds
      • Form plasmodium  a mass of cytoplasm with diploid nuclei but no cell wall or membranes
    • Break down organic matter
  • Phylum Acrasiomycota
    • Cellular slime molds
    • Live as independent amoeba-like cells until food becomes scarce
    • Haploid during entire life cycle
  • Phylum Oomycota
    • Water molds and downy mildews
    • Feed on dead organisms or are parasites