Download Flower Organs

FLOWER ORGANS
Biology - 23.2
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PLANT ORGANS
Some flower organs are
responsible for support
or function, but others
function in a
reproductive role.
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PLANT ORGANS
In general, flowers have
four organs:
1) Sepals
2) Petals
3) Stamens
4) Pistils – one or
more.
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PLANT ORGANS
SEPALS
Sepals protect the
flower bud and can look
like small leaves or
even resemble the
flower’s petals.
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PLANT ORGANS
PETALS
Petals are usually
colorful structures that
can both attract
pollinators and provide
them with a landing
platform.
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PLANT ORGANS
Sepals and petals, if
present, are attached to
a flower stalk, called a
peduncle.
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PLANT ORGANS
Most flowers have
several stamens – the
male reproductive
organs.
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PLANT ORGANS
Stamens are composed
of two parts:
1) Filament-supports
the anther
2) Anther-Forms the
pollen grains.
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PLANT ORGANS
The female
reproductive part of the
flower is the pistil,
located in the center of
the flower.
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PLANT ORGANS
The pistil usually has three
parts:
1) Stigma – tip of the pistil.
This is where
pollination occurs.
2) Style – Part that
connects the stigma to
the ovary
3) Ovary – contains one or
more ovules which is
where the egg forms.
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PLANT ORGANS
STRUCTURAL
DIFFERENCES
Flowers that have
sepals, petals,
stamens, and one or
more pistils are called
complete flowers.
If one is missing, it is an
incomplete flower.
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PLANT ORGANS
Pollination mechanisms
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PLANT ORGANS
Pollination mechanisms
1) Animal pollination – insects or other small
animals (bats, birds) move from flower to
flower searching for nectar.
2) Wind Pollination
3) Self Pollination
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