3.4 - Plant Fertilisation

Pollen grain on the stigma ->germinate( the tube grows - only the same species)

The pollen tube will go down to the ovule where the  pollen nucleus will travel there.

These things will occur :

1. Fertilisation Pollen nucleust will fertilise the Ovule -> will lead to Zygote  -> Embryonic plant

2. Outside Ovule forms a seed coast ( TESTA) 

3.Formation of the Cotyledons - food store for the seedling which will surpport the plant

4. Thickness of the walls of ovary -> plant will put alot of energy in here eg. sugar , protein ->build these up and form the fruit

3.3b - Wind Pollination

Process of wind pollination - Transfering pollen from anther to another flower's stigma by wind

Pollen grain adaptation
- light weight ( wing feature) travel through the air more effieciently
- Anther will hang well clear so they exposed to the wind
- stigma - very large surface area to catch the pollen grain through the wind ( feather like structure)

Some plants like Grass do not need to attract the insects so they don't need colour , scents or food ;  No point, only wasting energy because they are the wind pollinated plant.

Example : The Grass flower diagram

3.3a - Insect Pollination

1.Process of pollinating flower - transfer of pollen grains from the anther from one plant to a stigma of another.
2. Pollen small structure which contains the male nuclei and the transfer by the insects

3.The flower must attract the insects into the flower and have the reason to go to the second
Cross pollination = when pollen goes from one plant to another


Adaptation of flower to attract Insect : 
Signals - Colour petals
            - Scents
Value - Food nectaries / Fructose
          - Pollen Protein


Structure
Stamen ( male) = anther -> makes the pollen & filaments ( stalk)
Carpel ( female) = stigma ( where the pollen falls) , style ( connects stigma to the ovary)
eggs in the plant are called Ovules