Transcript Flowers

Flowers
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Monocots
Flowers
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Monocots
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-veins in most are parallel
Flowers
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Monocots
-veins in most are parallel
-flower parts in 3’s or
multiples of 3
Flowers
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Monocots
-veins in most are parallel
-flower parts in 3’s or
multiples of 3
-vascular bundles are
scattered in a cross section
of a stem
Flowers
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Monocots
-veins in most are parallel
-flower parts in 3’s or
multiples of 3
-vascular bundles are
scattered in a cross section
of a stem
-stems of most monocots do
not grow thicker from year
to year
Flowers
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Monocots
-veins in most are parallel
-flower parts in 3’s or
multiples of 3
-vascular bundles are
scattered in a cross section
of a stem
-stems of most monocots do
not grow thicker from year
to year
-in roots bundles of xylem &
phloem alternate in a circle
Flowers
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Monocots
-veins in most are parallel
-flower parts in 3’s or
multiples of 3
-vascular bundles are
scattered in a cross section
of a stem
-stems of most monocots do
not grow thicker from year
to year
-in roots bundles of xylem &
phloem alternate in a circle
Flowers
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Dicots
Flowers
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Dicots
-veins in leaves form branching
network
Flowers
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Dicots
-veins in leaves form branching
network
-flower parts in 4’s or 5’s or
multiples of 4 or 5
Flowers
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Dicots
-veins in leaves form branching
network
-flower parts in 4’s or 5’s or
multiples of 4 or 5
-vascular bundles of stem are
arranged in a ring
Flowers
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Dicots
-veins in leaves form branching
network
-flower parts in 4’s or 5’s or
multiples of 4 or 5
-vascular bundles of stem are
arranged in a ring
-stems can grow thicker from
year to year
Flowers
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Dicots
-veins in leaves form branching
network
-flower parts in 4’s or 5’s or
multiples of 4 or 5
-vascular bundles of stem are
arranged in a ring
-stems can grow thicker from
year to year
-single mass of xylem forms an
“X” in root, phloem is located
between arms of “X”
Flowers
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Dicots
-veins in leaves form branching
network
-flower parts in 4’s or 5’s or
multiples of 4 or 5
-vascular bundles of stem are
arranged in a ring
-stems can grow thicker from
year to year
-single mass of xylem forms an
“X” in root, phloem is located
between arms of “X”
Flowers
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Flower Structure
Flowers
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Flower Structure
-flowers are actually miniature
stems that produce four specialized
leaves
Flowers
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Flower Structure
-flowers are actually miniature
stems that produce four specialized
leaves
– Sepals
Flowers
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Flower Structure
-flowers are actually miniature
stems that produce four specialized
leaves
– Sepals
– Petals
Flowers
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Flower Structure
-flowers are actually miniature
stems that produce four specialized
leaves
– Sepals
– Petals
– Stamens
Flowers
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Flower Structure
-flowers are actually miniature
stems that produce four specialized
leaves
–
–
–
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Sepals
Petals
Stamens
Carpels
Flowers
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Sepals
Flowers
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Sepals
-in many flowers are
green
Flowers
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Sepals
-in many flowers are
green
-enclose the flower bud
before it opens
protecting the flower
Flowers
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Sepals
-in many flowers are
green
-enclose the flower bud
before it opens
protecting the flower
-all sepals together
form the calyx
Flowers
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Petals
Flowers
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Petal
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-second circle of flower parts
Flowers
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Petal
-second circle of flower parts
-often brightly colored
Flowers
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Petal
-second circle of flower parts
-often brightly colored
-all the petals form the
corolla
Flowers
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Petal
-second circle of flower parts
-often brightly colored
-all the petals form the
corolla
-often used to attract insects
Flowers
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Petal
-second circle of flower parts
-often brightly colored
-all the petals form the
corolla
-often used to attract insects
-because sepals and petals
do not form gametophytes
they are called “sterile”
leaves
Flowers
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Stamens
Flowers
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Stamens
-next circle of leaves inside
the petals
Flowers
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Stamens
-next circle of leaves inside
the petals
-has a long thin filament that
supports the anther
Flowers
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Stamens
-next circle of leaves inside
the petals
-has a long thin filament that
supports the anther
-male gametophytes are
formed inside the anther
Flowers
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Stamens
-next circle of leaves inside
the petals
-has a long thin filament that
supports the anther
-male gametophytes are
formed inside the anther
-grains of pollen are formed
on anthers
Flowers
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Stamens
-next circle of leaves inside
the petals
-has a long thin filament that
supports the anther
-male gametophytes are
formed inside the anther
-grains of pollen are formed
on anthers
-pollen divides to form 2
sperm nuclei
Flowers
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Stamens
-next circle of leaves inside
the petals
-has a long thin filament that
supports the anther
-male gametophytes are
formed inside the anther
-grains of pollen are formed
on anthers
-pollen divides to form 2
sperm nuclei
Flowers
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Carpels
Flowers
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Carpels
-center most circle of flower
parts
Flowers
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Carpels
-center most circle of flower
parts
-one or more carpels form
the pistil
Flowers
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Carpels
-center most circle of flower
parts
-one or more carpels form
the pistil
-the ovary is the base of the
pistil, the style is the stalk,
and the stigma is at the top
of the stalk
Flowers
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Carpels
-center most circle of flower
parts
-one or more carpels form
the pistil
-the ovary is the base of the
pistil, the style is the stalk,
and the stigma is at the top
of the stalk
-ovules are located inside
the ovary
Flowers
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Carpels
-center most circle of flower
parts
-one or more carpels form
the pistil
-the ovary is the base of the
pistil, the style is the stalk,
and the stigma is at the top
of the stalk
-ovules are located inside
the ovary
Flowers
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Pollination
Flowers
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Pollination
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-transfer of pollen to stigma
Flowers
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Pollination
-transfer of pollen to stigma
-self pollination - pollen can
fall from anther to stigma on
the same flower
Flowers
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Pollination
-transfer of pollen to stigma
-self pollination - pollen can
fall from anther to stigma on
the same flower
-cross pollination - pollen
must be transferred from
one flower to an other
Flowers
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Fertilization
Flowers
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Fertilization
-in angiosperms double
fertilization occurs
Flowers
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Fertilization
-in angiosperms double
fertilization occurs
-one sperm fuses with egg to
become the zygote
Flowers
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Fertilization
-in angiosperms double
fertilization occurs
-one sperm fuses with egg to
become the zygote
-other sperm fuses with 2
polar bodies to form a
triploid (3N) endosperm
Flowers
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Fertilization
-in angiosperms double
fertilization occurs
-one sperm fuses with egg to
become the zygote
-other sperm fuses with 2
polar bodies to form a
triploid (3N) endosperm
-endosperm is the food
source for the developing
embryo (rice, corn, wheat)
Perfect Flowers
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Contain both
male and
female sex
organs
Imperfect Flowers
Contain only
one sex on
flower
 Staminate –
Male only
 Pistillate –
Female only
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