L8 Plants - BILD 3 July 7, 2010 LAND PLANTS Evolved from...

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BILD 3 July 7, 2010 Woodruff: plants & fungi 1 LAND PLANTS Evolved from chlorophytes Adaptations to terrestrial life Bryophytes: mosses Seedless vascular plants: ferns Seed plant adaptations Gymnosperms Angiosperms: flowering plants Flowers, fruits, life cycle, diversity Fungi: decomposers, symbionts, pathogens Fungal life cycles Diversity: Chytrids, Zygomycetes, Glomeromycetes, Ascomycetes, Basidiomycetes 1. Ordovician, 475 mya, land plants 2. Silurian, 420 mys, vascular plants 3. Carboniferous, 305 mya, seed plants p. 605 FIVE KEY TRAITS OF LAND PLANTS Apical meristems Alternation of generations Walled spores produced in sporangia Multicellular gametangia Multicellular, dependent embryos Cuticle Mycorrhizal fungi associated with roots Secondary compounds 1. Ordovician, 475 mya, land plants 2. Silurian, 420 mys, vascular plants 3. Carboniferous, 305 mya, seed plants p. 605
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BILD 3 July 7, 2010 Woodruff: plants & fungi 2 Moss life cycle Dominant plant: gametophyte Water essential for fertilization Sporophyte is dependent on gametophyte FERN SPOROPHYTE, 2N Life cycles: focus on the general outlines not the details
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BILD 3 July 7, 2010 Woodruff: plants & fungi 3 HAPLOID SPORES PRODUCED BY MEIOSIS ON SPORANGIUM Diploid sporophyte grows out of haploid gametophyte called a prothallus 2N SPOROPHYTE FERN GAMETOPHYTE, N ARCHEGONIUM & ANTHERIDIUM (UNDER GAMETOPHYTE) ARCHEGONIUM PRODUCED HAPLOID EGG BY MITOSIS ANTHERIDIUM PRODUCES MOTILE SPERM BY MITOSIS FLAGELLA MOVE SPERM, OFTEN BETWEEN GAMETOPHYTES Carboniferous forest (350 mya): lycophytes (tree-like) horsetails, ferns. These coal-producing forests took CO 2
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L8 Plants - BILD 3 July 7, 2010 LAND PLANTS Evolved from...

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