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

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

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

Ranunculus acris - buttercup Flower Structure - review

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

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

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

Sexual Reproduction In Flowering Plants

by Geonyzl Alviola

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