[BIO SCI 94] - Final Exam Guide - Ultimate 152 pages long Study Guide!
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BIO SCI 94 Full Course Notes
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Green plants: green algae & land plants. Spores/zygotes encased in tough skins of sporopollenin. Green algae that are most similar to land plants are coleochaetes & stoneworts that lived in freshwater. Embryo lived in parents and got nourished from them. Challenges to living on land include . Increase parental contribution to zygote (more in each offspring) Spore - single cell produced by meiosis can develop into multicelluar adult. Sporopollenin - polymer, water-tight material that encases spores & pollen. Allows spores/zygotes to persist in the environments that are hostile. Allows plants to live on land in the absence of water. Synapomorphy that identifies non-vascular plants and green algae. Cuticle - waxy coating on outermost cell layer. Stomata - structures on plant surface permitting gas exchange for photosynthesis. Pores evolved first (for o2 and co2) guard cells (limit how much the pores can open) When stomata is closed, water does not escape. There was more uv radiation on land than in water.