1. 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

2. Flower Functions Leading to Sex
pollination
vectors: animals, wind
pollen tube growth
pollen dehiscence
chemotropism
syngamy x
What are the rest of the flower parts doing?

3. Anther Cross Section - How many anther sacs are present?
epidermis
vein
mesophyll
pollen grains

4. Pollen grain Tube Cell Generative Cell Pollen Wall cytoplasm cytoplasm
nucleus
nucleus
nucleolus
nucleolus
Digests path through stigma, style, and ovary.
Locates micropyle of ovule.
Penetrates into embryo sac.
Divides by mitosis to make two sperm.
Both join in syngamy events.
Pollen Wall
Waterproofing prevents desiccation during pollen transfer. Recognition proteins cause allergic reactions.

5. Pollen Grain Pollen Wall Fate: Digests Path to Egg Locates Micropyle
Tube
Cell
Generative Cell
Cytoplasm
Cytoplasm
Nucleus
Nucleus
Nucleolus
Nucleolus
Fate:
Digests Path to Egg
Locates Micropyle
Enters Embryo Sac
Is Burst to Release Sperm
Fate:
Follows Path of Tube
Divides by Mitosis
Makes Two Sperm
Both Have Syngamy

6. Pollen grain deposited by vector on stigma
Tube cell germinates through pollen wall
Pollen tube digests pathway to egg
Attracted to source of hormones, Calcium, Boron
Chemotropism toward micropyle of ovule
Penetrates into embryo sac
generative nucleus
pollen tube
Generative cell follows pathway of pollen tube.
Generative cell divides to make two sperm cells.
tube nucleus
tube nucleus
Golgi
and
vesicles
Synergids burst end of pollen tube.
Sperm released into embryo sac.
Syngamy events follow.

7. Rhododendron maximum ovule ls
Integument
3 Antipodal Cells
Embryo Sac
disintegrate
Central Cell
+ sperm = endosperm
Egg Cell
+ sperm = zygote
2 Synergid Cells
burst pollen tube
release sperm
disintegrate
Micropyle of Integument

8. Embryo Sac in Ovule Embryo Sac Ovule Integument Antipodals Funiculus
Central Cell
Micropyle
Egg
Synergids

9. Plant Pornography? Disintegrating Antipodals Central Cell Polar Nuclei
Sperm Nucleus
Syngamy Product = Endosperm 3N
Egg Cell
Sperm Nucleus
Egg Nucleus
Disintegrating Synergids
Syngamy Product = Zygote 2N

10. After Syngamy, the Names are Changed…
Egg becomes Zygote
Central cell becomes Endosperm
Ovule becomes Seed
Integument becomes Seed coat
Ovary wall becomes Fruit

11. Integument became seed coat
Capsella shepherd’s purse seed
Integument became seed coat
Egg became zygote
Zygote became embryo
Central Cell became endosperm
Ovary became fruit