3.4 Plant Fertilisation

- The pollen grains germinate: a tube begins to grow downwards. (note: the pollen tubes will only complete if they are from the same species)
- The tube goes all the way down and around into the yellow ovule
- Traveling down the pollen tubes are the male nucleus which goes into the ovule
1. Pollen nucleus will fertilise the ovule --> formation of Zygote and this will grow into the embryonic plant.
2. Outside the ovule forms the Testa (seed coat).
3. Formation of cotyledons = food stores for the seedling which will support the plant until it develops its first set of leaves.
4. Plant will put a lot of energy (sugars, protein) into the walls of the ovary / carpel. It will build up and form the fruit.