BSC 2011 Lecture Notes - Lecture 2: Meiosis, Synapomorphy, Sporopollenin

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2011
• Professor: Douglas, Norman A

Document Summary

Coleochaetophytes are closer related to land plants than to algae. Isogamy: gametes look the same and can only be identified by a + or - sign. Retention of the egg in the parental organism. Plasmodesmata (channel between cells) (little holes in the cell walls) First branched apical growth in plant history. Adapt to dry, high light (xeric) conditions. Develop transport systems for water and nutrients. Find new ways to disperse gametes and progeny. Waxy cuticle: cross section of a typical dicot leaf makes a impermeable layer that does not allow water vapor to escape the cell. Stomata: closable openings that regulate gas exchange allows the leaf to regulate the amount of water inside. When closed, the plant can regulate water and co2 levels. Pigments that protect against uv radiation (they don"t have water to absorb extra. Sporepollenin- spores protected against desiccation and decay by walls that are chemically resistant.