3.4 - Plant Fertilisation

- Pollen grains on stigma - germinate and tube begins to grow downwards
- One tube goes down to ovule - nucleus travels down this tube - into ovule 
4 things will happen 
- 1. Pollen nucleus will fertilise the ovule --> formation of zygote --> grown in to embryonic plant 
- 2. outside of ovule forms seed coat (TESTA) 
- 3. Inside formation of seed (cotyledons) - food stores for the seedling -- supports plant until it develops first sets of leaves 
- 4. Thickening of the walls of the ovary/carpel - plant will put energy (sugars, proteins) - will form the fruit - developed from the wall.