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Lecture20_PlantsI - transporting water and nutrients 1...

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Land Plants I I. What are the land plants? A. Where do plants occur on the tree of life? 1. Relationship to green algae Are land plants derived from green algae or green algae derived from land plants? Recent data on Chara as Green plants: all green algae + land plants 2. Current best estimate of land plant phylogeny Where did the transition to life on land occur? What types of habitats are occupied by liverworts, hornworts, and mosses? What types of habitats are occupied by gymnosperms and angiosperms? II. Adaptations to land … innovations that made it possible for land plants to occupy … explain the A. Resistance to drying 1. Cuticle All land plants have cuticle; where did it arise on the tree? 2. Pores and stomata (stoma; stomate and stomates) photosynthesis: problem of CO 2 acquisition
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Pores: Stomata: Note: Liverworts have All other land plants have B. Transporting water and nutrients Vascular tissue = highly organized, interacting groups of cells that are specialized for
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Unformatted text preview: transporting water and nutrients 1. Tracheids as early water-conducting cells in fossil record pits = places w/o secondary cell wall where liquids can pass • vessels evolved later perforations = places w/o primary or secondary cell wall 2. Why is vascular tissue important? • replace water lost when • structural support height = grow How does morphology of non-vascular plants compare to morphology of vascular plants? Which types of plants can grow in drier habitats? C. Gametangia 1. enclose gamete-producing tissue in protected structures 2. sperm to egg; egg is retained and embryo develops inside the • nutrients from gametophyte to • protection for egg and embryo from D. Pollen 1. What is pollen? Pollen = A male gametophyte • encased in a tough coat • transported by 2. What is the adaptive significance of pollen? In mosses, horsetails, ferns, etc … sperm are • dependence on • in transit, sperm are...
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