By Sangeeth George and Gianni Aranoff Green Algae By Sangeeth George and Gianni Aranoff

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

Examples Diatoms Volvox Ulva Dead man’s fingers

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

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

The End! Bye