17. PlantsPart2Fungi

17. PlantsPart2Fungi - 3/1/11 The Evolution of Plants They...

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3/1/11 1 The Evolution of Plants - They Made the Land Green, Part 2 1.We’ll use clickers today. 2.Diffusion HW due on Friday 3/4 3.Bring 2 calculators for each group on Friday, if possible 4.Exam regrade request due on Friday 3/4 Clicker question: Which plant life cycle is correct? Haploid stage Diploid stage fertilization meiosis Haploid stage Haploid stage fertilization meiosis 1. 3. Diploid stage Diploid stage fertilization meiosis 4. Diploid stage Haploid stage fertilization meiosis 2. Which stage is the gametophyte, and which stage is the sporophyte? Clicker question: A. ___ retained many features of aquatic ancestors, and B. ___ evolved most of the terrestrial adaptations 1. A. Sporophytes; B. Sporophytes. 2. A. Sporophytes; B. Gametophytes. 3. A. Gametophytes; B. Sporophytes. 4. A. Gametophytes; B. Gametophytes. Bryophytes - non-vascular plants Three phyla: liverworts, hornworts, mosses Abundant in moist habitats Persistent gametophytes, ephemeral dependent sporophytes Zygotes divide to form diploid embryos (young sporophytes) Mature sporophyte often develops three parts - capsule (sporangium producing haploid spores via meiosis), seta (stalk), and foot embedded in gametophyte for nutrition. Liverwort Hornwort Moss F Fig. 30.7
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3/1/11 2 1. First radiation of land plants - protection! Flowering plants F Fig. 30.9 Charophytes “Bryophytes” “Pteridophytes” Flowering plants #1 #4 #3 #2 cuticle/stomates enclosed embryo Land Plants = Embryophytes Pteridophytes - seedless vascular plants • major pteridophyte innovation was vascular tissue • xylem (water and ion transport) and phloem (sugar transport) • more efficient intercellular transport • greater size due to the hardening agent lignin in xylem • large sporophytes with vascular tissue • small free-living gametophytes without vascular tissue lycophytes ferns horsetails F Fig. 30.7 2. Vascular plants - one major innovation Flowering plants F Fig. 30.9 Charophytes “Bryophytes” “Pteridophytes” Flowering plants #1 #4 #3 #2 cuticle/stomates enclosed embryo Vascular plants vascular tissue Gymnosperms - vascular plants with naked seeds • Major innovations - seeds and pollen (with very reduced, microscopic gametophytes) • 4 major groups with a total of 800 tree and shrub species • Dominant tree species at high elevations and high latitudes, plus certain arid environments F Fig. 30.7
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3/1/11 3 3. Seed plants - two major innovations Flowering plants F Fig. 30.9 Charophytes “Bryophytes” “Pteridophytes” #1 #4 #3 #2 cuticle/stomates enclosed embryo Flowering plants Seed plants vascular tissue seeds, pollen Angiosperms - vascular seed plants with flowers and fruits as reproductive structures • 4th radiation of land plants - the origin of flowers • >250,000 species (~ 90% of land plants)
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17. PlantsPart2Fungi - 3/1/11 The Evolution of Plants They...

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