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Sexual Reproduction in Flowering Plants

Sexual Reproduction in Flowering Plants Visit: http://koning.ecsu.ctstateu.edu/Plants_Human/lecppt/flower.ppt Alternation of Generations in Plants Life Cycle of a Typical Animal Life Cycle of a Typical Plant Flowers and Fossils The Rise and Fall of Dinosaurs

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Sexual Reproduction in Flowering Plants

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  1. Sexual Reproduction in Flowering Plants Visit: http://koning.ecsu.ctstateu.edu/Plants_Human/lecppt/flower.ppt

  2. Alternation of Generations in Plants Life Cycle of a Typical Animal Life Cycle of a Typical Plant

  3. Flowers and Fossils

  4. The Rise and Fall of Dinosaurs • Dinosaurs are found in the fossil record starting about 230 million years ago. • The last dinosaurs bcame extinct about 65 million years ago. • Impact Hypothesis: A 10km-wide meteorite had smashed into the Yucatan peninsula in Mexico, causing worldwide forest fires, tsunamis several kilometres high, and an 'impact winter'

  5. The Rise and Fall of Dinosaurs • Evidence prior to impact that diversity of dinosaur species was on the decline. • Climate change? • Rise of Angiosperms? • Sometime in the Mid- Cretaceous Period; between 144 to 65 Million Years Ago • Corresponds with a decline of the gymnosperms and rise of animal groups

  6. Why Dinosaurs Went Extinct! The Far Side by Gary Larson.

  7. Basic Flower Structure stigma carpel gynoecium Flower is perfect Flower is monoecious locule style pollen ovary ovule anther filament stamen androecium petal corolla sepal perianth receptacle calyx Perianth is complete pedicel

  8. Some Example Stories: Perfect Flowers: Pea exclusively self-pollinating Hibiscus self-pollinating if not crossed Cherry self-incompatible only outcrosses Imperfect Flowers: Begonia unisexual but monoecious Holly unisexual and dioecious Variable: Cucumber male, perfect, female, parthenocarpic

  9. Basic Flower Structure stigma carpel Pistil is simple gynoecium Flower is perfect Flower is monoecious locule style pollen ovary ovule anther superior filament stamen Flower is hypogynous androecium petal corolla sepal perianth receptacle calyx Perianth is complete pedicel

  10. Ovary Superior Flower Hypogynous Ovary Half-Superior Flower Perigynous Ovary Half-Inferior Flower Epigynous Ovary Inferior

  11. Flower Structure - review Ranunculus acris - buttercup

  12. Basic Flower Structure stigma carpel Pistil is simple gynoecium Flower is perfect Flower is monoecious locule style pollen ovary ovule anther superior filament stamen Flower is hypogynous androecium petal corolla sepal perianth receptacle calyx Perianth is complete pedicel This longitudinal section view does not allow us to consider symmetry

  13. Flower Formula:Symbol Sequence to Diagram Flower Symmetry: *=radial †=bilateral * * 5, * 5, 5, * 5, 5, , * 5, 5, , 5 Number of Parts per Whorl: • sepals in calyx • petals in corolla • stamens in androecium • carpels in gynoecium Fusion within whorl: curved line over number Fusion between whorls: square bracket below numbers Attachment of flower parts relative to ovary: horizontal line

  14. 1 1 Ovary Superior Flower Hypogynous Ovary Half-Superior Flower Perigynous 1 Ovary Half-Inferior Flower Epigynous Ovary Inferior

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