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12-1Coloniz of land_Lecture 36

12-1Coloniz of land_Lecture 36 - Plants The Conquest of...

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5/10/11 Plants & The Conquest of Land Organic food Oxygen Habitat Medicines Fibers (cellulose) Building materials Biofuels ü Bryophytes (e.g. mosses) ü Lycophytes ü Pteridophytes (e.g. ferns) Gymnosperms (e.g. conifers Angiosperms (flowering plants)
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5/10/11 Resistant polymers: sporopollenin, lignin,& cutin (the “bones” of plant fossils) Plant evolutionary history can be Traced with molecules & fossils
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5/10/11 Plants evolved from aquatic, autotrophic protists whose modern descendants are known as charophycean green algae .
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5/10/11 From charophycean algae, plants inherited: 1. Primary plastids with starch°animal food 2. Multicellularity with intercellular communication–plasmodesmata 3. Sexual reproduction with egg & sperm produced by mitosis (not by meiosis) .
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5/10/11 4. Cellulose that is fairly resistant to microbial breakdown
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5/10/11 6. Placenta Tissue composed of cells that are specialized for rapid transport of nutrients from mother to embryo (increases SA for membrane transport).
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5/10/11 New features of early plants (not present in algal relatives)
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