6th Grade Science
Ms. Koennecke
Growing and Flowing
6.L.1.1 – Structures of
Flowering Plants
LEAVES
STEM
ROOTS
Basic Parts of Plants
1. Leaves: take in
carbon dioxide &
sunlight to be
used in
photosynthesis
2. Stems: support
branches, leaves,
& flowers
3. Roots: secures
plant in place,
absorbs minerals
& water, stores
energy
Stomata: tiny openings
under leaves through
which gases and water
vapor pass
Guard Cell:
paired cells
that control
the opening &
closing of a
leaf’s stoma
The process of sexual
reproduction in flowering
plants takes place in the
flower, which is made up of
several parts.
Some parts of the flower are
directly involved in fertilization
and seed production. Other flower
parts have functions in pollination.
Flower parts:
1. Petals – leaf-like
colorful part of a
flower used to attract
insects and birds
2. Sepals – modified leafs
protect the bud of a
young flower
3. Receptacle – the
section where the
reproductive parts of a
plant are attached
Stamens – the male part
of a flower. The
stamens include the
anther (which
produces pollen
grains that develop
sperm) and the
filament (which is a
stalk that support the
anther)
Pistils – the female part of
the flower. The pistils
include the stigma (which
is the sticky pollenreceptive part of the pistil)
the style (which is the stalk
of the pistil down which
the pollen tube grows) and
the ovary (which contain
the ovules and becomes
the fruit). The ovule
becomes the seeds when
sperm cells fertilize the
egg cells
Pollination: When pollen is transferred from
the anther to the stigma (if same plant=self
pollination; if different plant of same species =
cross-pollination). Plants that are cross
pollinated produce stronger plants.
Kidsgrowingstrong.org
Kidsgrowingstrong.org
There are three
different ways
pollination can
occur: through
insect/animal
transfer, through
wind transfer, and
through human
transfer.
http://www.britannica.com/EBchecked/media/16679/Dandelions-arecapable-of-both-self-pollination-and-cross-pollination
http://www.britannica.com/EBchec
ked/topic/467948/pollination/7589
7/Agents-of-pollen-dispersal
How do plants defend themselves?
1. Secrete bad smells
2. Secrete poisons
3. Built in defenses like “thorns”
http://www.mbgnet.net/bioplants/pollination.html