Lecture 22 Plants

Lecture 22 Plants - Our Schedule Dr Kevin Gurney Office LSA rm 364 Phone 965-4556 Email [email protected] Office Hrs MW 3-4 pm Speed timing may

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Our Schedule Speed, timing may vary Lecture and book I will emphasize concepts Study guide 2 quizzes (online as before) Dr. Kevin Gurney Office: LSA, rm 364 Phone: 965-4556 Email: [email protected] Office Hrs: MW: 3-4 pm 23.0000 27.0526 31.1053 35.1579 39.2105 43.2632 47.3158 51.3684 55.4211 59.4737 63.5263 67.5789 71.6316 75.6842 79.7368 83.7895 87.8421 91.8947 95.9474 100.0000 Var1 0 5 10 15 20 25 30 35 40 45 No of obs
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Plants • How Did the Land Plants Arise? • How Did Plants Colonize and Thrive on Land? • What Features Distinguish the Vascular Plants? • How Did Seed Plants Become Today’s Dominant Vegetation? • What Features Contributed to the Success of the Angiosperms? A trait that is shared by two or more taxa How Did the Land Plants Arise? Land plants are monophyletic One synapomorphy : Development from an embryo protected by tissues of the parent plant. Also called embryophytes . Descended from a common ancestor
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What Is a Plant? Microscopic freshwater algae Microscopic freshwater algae Cells that photosythesize Cells that photosythesize The Evolution of Plants Water- conducting cells Water- conducting cells The leaf The leaf
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Time History How Did Plants Colonize and Thrive on Land? Adaptations were needed to survive in a dry environment. A way to transport water to all portions of plant Structural support Method to Disperse gametes
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Characteristics of LAND PLANTS There are seven: 1. The cuticle —waxy covering that retards water loss 2. Stomata —openings in stems and leaves; regulate gas exchange 3. Gametangia enclosing gametes (sperm and eggs) 4. Embryos in a protective structure 5. Pigments that protect against UV radiation 6. Spore walls containing sporopollenin protects from dessication and decay 7. Mutualistic relationships with fungi that promote nutrient uptake from soil What Features Distinguish the Vascular Plants? Let’s focus on just the
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This note was uploaded on 04/18/2011 for the course BIO 182 taught by Professor Jacobson during the Fall '11 term at ASU.

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Lecture 22 Plants - Our Schedule Dr Kevin Gurney Office LSA rm 364 Phone 965-4556 Email [email protected] Office Hrs MW 3-4 pm Speed timing may

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