Green%20Algae

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Green Algae

• By Sangeeth George and Gianni Aranoff

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Basic Facts

• Phylum Chlorophyta
• Perform photosynthesis
• Most possess cell walls with cellulose
• Generally accepted that plants arose from
  ancestral green algae
• Live in both aquatic and terrestrial environments
• Aquatic primarily freshwater but some are marine
• Terrestrial damp soil, cracks in tree bark
• Some are symbionts with other organisms
• Ex. Some grow together with fungi as dual
  organisms called lichens

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Examples
Diatoms
Volvox
Ulva
Dead mans fingers
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Body Types

• Extremely diverse
• Some are
• Single cells
• Colonial farms
• Multinucleate
• Multicellular filaments and sheets
• Movement
• Many have flagellum and are motile
• Some are totally nonmotile

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Reproduction

• Varied
• Asexual
• Binary fission in single cells
• Fragmentation in multicellular forms
• Many produce spores by mitosis
• Sexual
• Involves the formation of gametes in unicellular
  gametangia
• Isogamous - 2 identical flagellated gametes fuse
• Anisogamous - 2 different flagellated gametes
  fuse
• Oogamous produce a nonmotile egg and a
  flagellated male gamete
• Some exchange genetic info by conjugation

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The End!
Bye