Transcript The transfer of pollen grains from the anther to the sitgma of a flower

EVA MARÍA MORENO BERDÓN 5ºA
 Are
the sexual organs of flowering plants
 Most flowers have got four main parts
 Have
various functions and purposes depending on
the type of plant.
 In general
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
Petals protect some parts of the flower
Attract/repel specific pollinators
All petals together form the corolla
Surround the reproductive parts of flowers
-Petals
are usually
accompanied by another set
of special leaves
called sepals
-Petals look like brigthly
coloured leaves to attract
pollinators
 The
outer parts of the flower
 Protect the delicate inner parts of the flower
 There are usually as many sepals as petals
 They alternate with the petals
-Consists
of green
leaf-like structures
-Grow
at the base of
the flower
- All the sepals
together form the
calyx
 Is
the plant’s female reproductive organ
 The pistil consists of ovule-bearing basic units
called carpels
 A flower may have one or more pistils
Has three main
parts:
 Stigma:
area where
the pollen is
received
 Style: where the
stigma is born
 Ovary: contains the
embryo seeds or
ovules
 Are
the plant’s male reproductive organs
 Each stamen has got


A tube called filament
A sac called anther

Each anther contain many grains of pollen
 The
pollen is produced in chambers which
contains the male gametes
 Then it is transferred to the pistil for
fertilisation to take place.
The transfer of pollen grains from the
anther to the sitgma of a flower
 Flowering
plants use the wind, insects,
bats, birds and mammals to transfer
pollen from the male (stamen) part of the
flower to the female (stigma) part of the
flower.
Insects
Other animals
(birds)
Wind
Pollen sticks
to parts of
insect’s
bodies. Then
is carried into
other plants
These animals
are usually
nectardrinking
animals like
sunbirds
Pollen tend to
be smaller
and lighter in
order to be
carried by the
wind
 Self-pollination



 Cross-pollination
Transfer of pollen
grains within one
flower
One flower
Pollen grains from the
anther are transferred
into the stigma
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Transfer of pollen grains from
one flower to another
Two similar flowers
Pollen grains from the anther
of one flower transferred
into the stigma of the other
flower
 Male
and female sex cells must meet and fuse to
form fruits and seeds
 When the male cells meet with the female cell, it
is called fertilization.
 This is also called sexual
reproduction because male
and female sex cells are
involved
 The
growth of the root through the seed coat
-When
a seed lands on a
place with sufficient
warmth, water and air, it
starts to germinate
1º The root of the baby plant grows out of
the seed
2º The seed coat falls on the ground
3º The shoot appears and breaks through the
soil and the first leaves show
4º The cotyldeons fall on the ground
5º The young plant now can make its own
food with the sunlight by photosynthesis
A
plant story
 Parts
of a flower
 Life
 Go
cycle of a plant
flower grow
 How
plants grow
 Kinder
garden game
- How many parts have the flower?
It has four main parts: petals, sepal, pistil and
stamen
-
All petals together form the…?
They form the corolla
- What protect sepals?
They protect the inner parts of the flowers
- Where sepals grow?
They grow at the base of the flower
-
What are the three main parts of the pistil?
Stigma, style and ovary
-
What is pollination?
Pollination is the transfer of pollen grains form the
anther to the stigma of a flower
-
Which are the agents of pollination?
The different agents of pollination are insects,
other animals like birds and wind
-
In which type of pollination the pollen grains are
transfered from one flower to another?
In cross pollination
-
When the male sex cells join with the female sex
cells within an ovule is called…
Fertilisation
-
Which are the parts of the stamen?
Filament and anther