Look at the diagram of a flower. Most flowers form
as a series of rings. The outer ring is made up of sepals.
Sepals are usually green and look like leaves attached to the stem at the
base of the flower. The colorful petals make up the next ring.
Inside the ring of petals, in the center of the flower, are the reproductive
parts of the plant. The stamens are the male reproductive
organs. Notice that each stamen has an anther on its tip. This
is where millions of tiny pollen grains are attached. The solid tube
called the pistil is the female part of the flower. The pistil
contains the ovary and egg/eggs.
The first step of fertilization is pollination.
Pollination is the movement of pollen from the anther to the sticky top of
the pistil. Birds and insects are responsible for pollinating many
flowers. They knock pollen off the anther and onto the pistil.
Rain and wind also aid in pollination.
After pollination, a tube grows out of the
pollen grain that is stuck to the pistil. Inside the pollen tube is
the sperm. The tube grows down into the ovule, which is at the
bottom of the pistil and fertilization occurs. The fertilized egg
cell begins to divide and form a young organism called an embryo.
The ovule grows into a covering that protects what has now become a seed.
As this seed forms in the parent plant, the flower changes. The
sepals and petals die and fall off. The ovule grows into a seed with
a covering such as beans, berries, tomatoes, or the hard
shells of nuts. This covering protects the seed/seeds and also helps
scatter the seeds.
When the fruit leaves the plant it starts to
decay. This allows the seeds inside to reach the soil where they can
grow into new plants. These seeds are sometimes pushed into the soil
by rain. Animals like squirrels and chipmunks bury seeds as well.
Look at the diagram of the seed. When seeds are
planted in soil they absorb water. As temperatures become warmer the
cells of the embryo inside the seed begin to divide, and the embryo
grows. The embryo continues to use the stored food within the seed
and eventually breaks through the seed coat. Roots sprout and it is
now a new plant. The sprouting of a new plant is called germination.
The roots of this new plant take in minerals and water
to help it grow. As the stem grows up, leaves begin to appear.
The leaves help the plant make its own food. The plant becomes an
adult plant that will develop flowers, flowers develop seeds, and the
cycle begins again.
Directions: Answer the questions
about seeds and flowers.
found at the base of a flower.
2. The stamens are the
3. Each stamen has an
on its tip. This is where millions of tiny
grains are attached.
4. The pistil is the
part of the flower.
5. The pistil contains the
and the egg/eggs.
6. Pollination is the movement of pollen from
the anther to the sticky top of the
7. Fertilization occurs when a tube grows out
of the pollen grain into the
also called the ovary, and joins with an egg.
8. The fertilized egg cell begins to divide
and form a young organism called an
9. As the seed forms in the parent plant, the
10. Animals like squirrels and chipmunks bury
seeds, and they are sometimes pushed into the soil by
11. The sprouting of a new plant is called
12. Plant seeds come from
fruits and flowers.
None of the above.
13. The embryo grows by using the stored
food in the
All of the above.
14. The roots of a new plant take in
minerals and water.
None of the above.
15. The leaves of a plant make
All of the above.
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