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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

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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
Alternation of Generations in Plants

Life Cycle of a Typical Animal

Life Cycle of a Typical Plant

the rise and fall of dinosaurs
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 dinosaurs5
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
Why Dinosaurs Went Extinct!

The Far Side by Gary Larson.

slide7

Basic Flower Structure

stigma

carpel

gynoecium

Flower is perfect

Flower is monoecious

locule

style

pollen

ovary

ovule

anther

filament

stamen

androecium

petal

corolla

sepal

perianth

receptacle

calyx

Perianth is complete

pedicel

slide8

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

slide9

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

sepal

perianth

receptacle

calyx

Perianth is complete

pedicel

slide10

Ovary Superior

Flower Hypogynous

Ovary Half-Superior

Flower Perigynous

Ovary Half-Inferior

Flower Epigynous

Ovary Inferior

slide11

Flower Structure - review

Ranunculus acris - buttercup

slide12

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

sepal

perianth

receptacle

calyx

Perianth is complete

pedicel

This longitudinal section view does not allow us to consider symmetry

slide13

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

slide14

1

1

Ovary Superior

Flower Hypogynous

Ovary Half-Superior

Flower Perigynous

1

Ovary Half-Inferior

Flower Epigynous

Ovary Inferior