3.4 - Plant Fertilisation

-The pollen tubes will only complete if they are from the same species
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.