1. Sexual Reproduction in Flowering Plants
Visit:

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
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

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
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

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. 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

13. 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

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