BIOL 110 Chapter Notes - Chapter 23: Geologic Time Scale, Green Algae, Charophyta
Document Summary
Plants share a common ancestor with green algae: green algae group called charophytes. Chlorophytes have the same photosynthetic pigments as found in plants, cellulose cell wall, starch carbon storage, and cell plate during cytokinesis (also dna) Charophytes are different from plants because they are adapted to an aquatic environment. Alternation of generations: haploid, diploid stages, alternation of generations - life cycle that includes the alternation between multicellular haploid life stages and multicellular diploid life stages. These two stages alternate back and forth. Geologic time scale for plant evolution: plants slowly evolved to exist in terrestrial environments through periods of drying in their aquatic environments (natural selection, land plants - 600 million years ago. The transition from aquatic to terrestrial environments: plants arose when the earth"s climate was changing, periods of flooding and drying, plants adapted to drier conditions so they could fully colonize the land.
