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 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'

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

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

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

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

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

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

Flower Structure - review Ranunculus acris - buttercup

This longitudinal section view does not allow us to consider symmetry Basic Flower Structure stigma carpel Pistil is simple gynoecium locule Flower is perfect Flower is monoecious style pollen ovule ovary 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

Flower Formula: Symbol Sequence to Diagram Flower * 5, 5, , 5 * 5, 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

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