3.4 Plant Fertilisation

Understand that that the growth of the pollen tube followed by fertilisation leads to seed and fruit formation.

Pollen grain rests on the stigma and germinates, growing a pollen tube all the way down to the ovule. The male nucleus of the pollen will fertilise the ovule leading to the formation of a zygote which then grows into an embryonic plant. The outside of the ovule forms a testa (seed coat)while the inside forms a cotelydon which is a food store for the young seedling. and the walls of the ovary becomes a fruit.