Transcript Plant Reproduction

Pollen and ovules
Can you name the parts of a flower?
Start at the top and work anti-clockwise.
PETALS
STAMEN {
anther
filament
stigma
style
ovary
sepal
ovule
NECTARY
The stamens of a flower make pollen. Pollen moves
from one flower to another carried by insects, birds or
the wind. This is called pollination.
• Some pollen grains are very light and
can be carried by the air. Others have
points that catch in the hairs of insects.
• Inside the pollen grain are special cells
that are the male sex cells of the plant.
Some pollen grains are
trapped by the sugary
solution on the stigma.
The sugar makes the
pollen grain begin to grow
a long tube.
The pollen tube grows
down the style to an
ovule.
The nucleus of the pollen
cells travels down the tube
and joins with the egg
nucleus in the ovule.
This is called fertilisation.
Now the two nuclei are
joined together they form a
seed. The seed has a tough
coat and a store of nutrients.
Can you put these events
in the right order?
1. Pollen lands on stigma
2. Pollen formed on anther
3. Nucleus joins with egg cell
in ovule
4. Pollen tube reaches ovule
5. Pollen tube starting to form
6. Nucleus travels down tube
The correct order is...
2. Pollen formed on anther
1. Pollen lands on stigma
5. Pollen tube starting to form
4. Pollen tube reaches ovule
6. Nucleus travels down tube
3. Nucleus joins with egg cell
in ovule