all about double fertilisation

1. The stages of fertilisation in a
flowering plant

2. Structures in a flower
Stigma – the female part of a flower
where pollen grains land
Anther – the male part of the flower
that contains pollen grains, the male
gamete
Style – the female part of a flower that
connects the stigma to the ovary
Ovary – the female part of the
flower that contains the female
gametes, the ovules
Ovule – the female
sex cell
Filament – the male part of the flower
that holds up the anthers

3. The stages of pollination
A pollen grain from
the same or a
different flower, lands
on the stigma.

4. The pollen grain on the
stigma stimulates a pollen
tube to start forming.
The pollen tube grows
down the style ,the tip of
the tube has three nuclei.
The pollen grain
nucleus travels down the
pollen tube and two
haploid male gametes are
behind it.
The stages of pollination

5. The pollen tube continues to
grown until it reaches the
opening of ovary called
micropyle
The tube nucleus
disintegrates and male
gametes are released.
One male gamete nucleus
fuses with the female gamete
(ovary) to form diploid zygote
The other male gamete fuses
with diploid nucleus to form
triploid endosperm.
The stages of pollination

6. The pollen tube continues to
grown until it reaches the
opening of ovary called
micropyle
The tube nucleus
disintegrates and male
gametes are released.
One male gamete nucleus
fuses with the female gamete
(ovary) to form diploid zygote
The other male gamete fuses
with diploid nucleus to form
triploid endosperm.
The stages of pollination