Transcript Science Powerpoint

Plant
Reproduction
Reem Abdalla
Reproduction
in Plants
Reproduction means producing new
living things. Animals and plants
reproduce to make new individuals of
the same species.
There are two main
of reproducing in
plants:
1. Asexual Reproduction
2. Sexual Reproduction
Asexual Reproduction
Asexual Reproduction is reproducing plants similar to itself without
the use of sex.
•Asexual reproduction only requires one parent
•All the offspring are identical to the parent as well as having the
same genes.
•They are called Clones
Hydra
The budding in a Hydra that live in
lakes.
Some
Examples:
Yeast
The budding in Yeast is asexual
reproduction, usually used in
bread.
Bread Mould
Spore formation in bread mould is
also considered asexual
reproduction, found in moldy
bread. When it bursts the spores
are spread and they then grow.
Sexual Reproduction
Sexual Reproduction is reproducing using sex. Some plants can be unisex
(only has 1 sexual part, male or female) and others bisexual (has both the
sexual organs of a male and a female like a flower).
Flowers
Flowers are an example of a plant that use sexual
reproduction to reproduce. Flowers have both the
organs of a female and a male, making it bisexual. You
will see the structure of a flower and its parts as well as
their role/function in the process of reproduction.
Pistil
The pistil is the sexual organ of a
female. It is divided into three
parts, the stigma at the top, the
middle is the style and last part is
called a ovary which contains the
ovules.
Stamen
The stamen is the sexual organ of
a male. It is divided into 2 parts,
the anther which contains the
pollen and the filament.
The Structure of a Flower
Parts and their Function

Stamen:
1.
2.

3. Ovary: stores the ovules
Anther: Contains the pollen, it
eventually bursts and the pollen
travels…
Filament
Pistil:
1.
Stigma: It is sticky with pollen
and it serves as the ‘entrance’
for the pollen as well
2.
Style: The pollen travels down
this part to get to the ovary


Ovules: they fuse with the
pollen to create a seed
Petals: colorful to attract bees
and other ‘pollinators’
How It All Fits Together…
When the anther of the stamen burst and releases the pollen
within it, the pollen it quickly spread, whether it rides the wind
or travels on other animals etc, which is called pollination.
When the pollen reaches another flower it enters through the
stigma of a pistil, down its style and to the ovary. The nucleus
of the ovules and the pollen then fuse. When this process is
complete, the flower is then ‘fertilized.’ After this has been
completed, the whole structure falls off except the ovary, which
then makes a fruit and the fused ovules and pollen make the
seed. The flower is now developed.
Pollination is when the
pollen from the stamen
reaches a pistil of a
flower. Some examples
of Pollinators that carry
the pollen:
Humming Birds
Butterflies
Honey Bees
Seeds
The result, as I mentioned before, of an
ovule and pollen is a seed. There are
two types of seeds:
•Dicot Seed
•Monocot Seed
I will also talk to you about the
conditions they need to germinate and
how they do so.
Dicot Seed
A Dicot seed can easily split in half
and contains 2 leaves.
Monocot Seed
A monocot seed is a one piece
seed and contains only 1 leaf.
About the Dicot Seed
Di comes from the Greek Dis which
means 2. It has a soft outside
covering called a seed coat and it will
probably slip off easily. It also has a
slit in the middle, making it easy to
split in half and view its contents.
Inside is a small plant called an
embryo the the two large parts are
called cotyledons, which give the
plant food as it grows. The plumule
emerge upon germination, enlarge
and become green to become leaves.
The upper part of the embryo is the
epicotyl and the middle part is the
hypocotyl and the lower part of the
embryo is the radicle.
Germination of a
Seed
Germination is the early stage in the growing or
development of a seed. However, for this process to
occur, it needs certain conditions and it follows several
steps which I will be taking you through.
Condition for Germination
•Soil
•Nutrients
•Right amount of water
•Sunlight
•The correct temperature
Stages of Germination
First, the radicle emerges and
inserts itself in the soil so it may
absorb the water and anchor the
seed to the ground. Next the
hypocotyl emerges and helps
the plant raise itself, the seed
coat has already come off. The
cotyledon then opens to release
the leaves and they grow and
enlarge, the cotyledons
eventually fall of the plant.
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