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19_Plant_diversification - Plant diversification Todays...

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Plant diversification Today’s question: I. What are land plants? II. What adaptations allowed plants to colonize land and diversify? * Cuticle and stomata * Vascular tissue * The embryophyte condition * Pollen * Seeds Hummingbird and pollination Orchid bees
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I. What are land plants?
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I. What are land plants? Most recent phylogeny:
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Are the following groups monophyletic? Non-vascular plants Seedless vascular plants Vascular plants Seed plants Gymnosperms Conifers Pondweed
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How big are today’s liverworts, mosses, and hornworts, and what types of habitats do they occupy? How big are today’s gymnosperms and angiosperms, and what types of habitats do they occupy? What do these observations imply about trends in land plant evolution?
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Land plants require: A. Protection of adult plant against drying out B. Efficient transport of materials through plant C. Protection from drying out during reproduction D. Efficient fertilization (pollen) http://www.youtube.com/watch?v=gEcv3dBuOe4 http://www.vcbio.science.ru.nl/images/pollen/pollen15.jpg (Alder pollen) Orchid bees
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