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Unformatted text preview: Chapter 30 GREEN PLANTS PIONEERS - The first terrestrial organisms. Summary *Why are plants important? *Evolution *4 major groups *Life cycle general *Key lineages Why are Plants Important? *3 categories: *Ecosystem services *Fuels and fibers *Other *Assignment: Read Why do Biologists Study the Green Plants? pp 627-630 and write a summary on the benefits of plants. Due next class period. Evolution *It started with green algae, confined to a watery environment, ~ 570 mya. *Land plants 1 st appeared about 450 mya, preceding land animals. *Invasion of land presented some of the same problems for plants as it did for animals: 4 Major Groups *Based on similar characteristics and order of evolution, fig 30.9. *Non-vascular land plants , mosses, liverworts and hornworts *Vascular plants *Seedless vascular plants , club mosses, ferns and horsetails *Gymnosperms have naked seeds that protect embryo, conifers, cycads and ginkgos. *Angiosperms have enclosed seeds (fruits) and flowers. Plant Life Cycles *Alternation of haploid (n) and diploid (2n) generations, fig 30.16....
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