Fertilisation of Flowering Plants

aeilish.wynne
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A Levels Biology Mind Map on Fertilisation of Flowering Plants, created by aeilish.wynne on 04/23/2014.

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aeilish.wynne
Created by aeilish.wynne over 5 years ago
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Fertilisation of Flowering Plants
1 4. In the embryo sac the tube nucleus disintegrates and the tip of the pollen tube bursts releasing the two male nuclei.
2 1. A pollen grain lands on the stigma of a flower. The grain absorbs water and splits open.
3 2. A pollen tube grows out of the grain down the style. There are 3 nuclei in the pollen tube one at the tip and two male gamete nuclei behind it.
4 3. When the tube reaches the ovary it grows through the micropyle and into the embryo sac in the ovule.
5 5. One male nucleus fuses with the egg nucleus to make a zygote. This divides by mitosis to become the embryo of the seed.
6 6. The second male nucles fuses with 2 other nuclei - known as the polar nuclei at the centre of the sac. This produces a cell with a large nucleus which divides to become a food store called the endosperm for the mature seed.
7 7. A double fertilisation has taken place which only happens in flowering plants.

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