Title: Sexual Reproduction in Flowering Plants
1Sexual Reproduction in Flowering Plants
Visit http//koning.ecsu.ctstateu.edu/Plants_Huma
n/lecppt/flower.ppt
2Alternation of Generations in Plants
Life Cycle of a Typical Animal
Life Cycle of a Typical Plant
3Flowers and Fossils
4The 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
5The 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
6Why Dinosaurs Went Extinct!
The Far Side by Gary Larson.
7Basic 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
8Some 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
9Basic 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
10Ovary Superior Flower Hypogynous
Flower Perigynous
Ovary Half-Superior
Ovary Half-Inferior
Flower Epigynous Ovary Inferior
11Flower Structure - review
Ranunculus acris - buttercup
12Basic 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
13Flower Formula Symbol Sequence to Diagram Flower
Symmetry radial bilateral
5
5 5
5 5 5
5 5
Number of Parts per Whorl
Fusion within whorl curved line over number
Fusion between whorls square bracket below
numbers
Attachment of flower parts relative to
ovary horizontal line
14Ovary Superior Flower Hypogynous
Flower Perigynous
Ovary Half-Superior
1
Ovary Half-Inferior
Flower Epigynous Ovary Inferior