BIOL 1200 Chapter Notes - Chapter 25: Lignin, Starch, Mycorrhiza
Document Summary
Early plant life, algae and evolutionary pathos to photosynthesis. The ancestors to the green algae became photosynthetic by endosymbiosing a green, photosynthetic bacterium about 1. 65 billion years ago. Algal line evolved into the charophytes-> then to modern mosses, ferns, gymnosperms, and angiosperms (evolutionary trajectory was relatively straight and monophyletic) Other algae (red, brown, golden, stramenopiles) became photosynthetic by external endosymbiotic events. Changed as animals emerged from water and fed on new abundant sources -> plants developed strategies to deter predation (spines, thorns, toxic chemicals) Strategies to combat dryness (early plants did not live far from sources of water: tolerance (moss - dry out but once it rains, it absorbs it and is restored) ***later, they moved further away using resistance to desiccation rather than tolerance (ex: cacti) Minimize water loss to which they survive in extremely dry areas: colonize environments with high humidity (droughts are uncommon) - 4 major adaptations in all terrestrial plants:
