Download PLANT REPRODUCTION AND BREEDING

TOPIC 3
PLANT REPRODUCTION AND
BREEDING
- people adapt plants to meet their needs.
- selective breeding is choosing specific
for their special characteristics.
plants
- the plants are cross-pollinated and their
offspring inherit the characteristics of
both parents.
- scientists can change plants by going
inside the plant cell and changing
some of the genetic material
Watch Video
- the part of the plant that control the
characteristics is the genes
PLANT REPRODUCTION
Asexual Reproduction
(Vegetative Reproduction)
- one parent plant
grows new plants
from its roots,
stems or leaves.
- the young plant is
identical to the
parent.
Layering
- produces plants
from the stems
- branch from the
parent bends to
the ground and
covers with soil
then grows
roots.
Grafting
- take a branch
from one tree
and attach it
to another
Cuttings
- cut a small
section of a leaf
or stem to grow
a new plant
Sexual Reproduction
- involves two parents
that produce seed
- plants are slightly
different from the
parents
- reproduce using seeds
- helps plants adapt to changes
Cone Bearing Plants
- female cone
contains ovules
(eggs)
- male cone has
pollen (sperm)
- pollen blows in
the wind to female
cone
- egg is fertilized
inand
the seed
coneis formed
Flowering Plants --Parts of the
Flower
Pollination
Pollination occurs when pollen has been
transferred from the anther to the
stigma. When the pollen grain
germinates on the stigma it creates a
burrow called the pollen tube as it
travels toward the ovary.
When the sperm cell from the pollen
grain reaches the ovary or ovule the
sperm joins with the egg. This is called
fertilization.
The fertilized zygote will become a tiny
new plant inside the seed. We call this
tiny new plant the embryo.
Fruit
- fruit is the growing
ovary of the plant
- protects the seeds of
the plant until they
are ripe
Seed Dispersal
Read page 127 and describe the six
ways plants can disperse seeds.
1.
2.
3.
4.
5.
6.
Germination
- the development of the seed into a plant