1 Sexual Reproduction in Flowering Plants Visit http//koning.ecsu.ctstateu.edu/Plants_Huma n/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.
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 perianth sepal 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 perianth sepal receptacle calyx Perianth is complete pedicel 10 Ovary Superior Flower Hypogynous Flower Perigynous Ovary Half-Superior 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 perianth sepal 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 Ovary Superior Flower Hypogynous Flower Perigynous Ovary Half-Superior 1 Ovary Half-Inferior Flower Epigynous Ovary Inferior
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