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PL ANT SEX!
WAIT…WHAT?
P L A N T R E P R O D U C T I O N A N D H OW I T
WO R K S !
ALL PLANTS DO IT…
STRUCTURES FOR PLANT
REPRODUCTION:
–Cones
–Flowers
–Pollen
–Ovules
–Seeds
CONES VS. FLOWERS
•Cones - the seed bearing structure of
non-flowering plants (gymnosperms)
•Flowers - the seed bearing structure of
flowering plants (angiosperms)
GYMNOSPERMS VS. ANGIOSPERMS
REPRODUCTION
GYMNOSPERMS
ANGIOSPERMS
THE ANGIO-DIFFERENCE:
DOUBLE INTERNAL FERTILIZATION
POLLEN, OVULES AND SEEDS
• Pollen – The male sex cell (sperm) is carried in a
pollen grain
• Ovule – The female sex cell (egg) is located in the
ovary.
• Seed – A structure that carries the embryo of a
plant (after fertilization)
FUNCTIONS OF SEEDS
• Protection -from
drying out and disease
• Nourishment –
contain cotyledons
(seed leaf) that supply
organic nutrients
• Dispersal – by wind,
water, and animals
• Delayed growth –
do not germinate until
conditions are
favorable
FLOWERS – THE REPRODUCTIVE STRUCTURE
Male
Part of
the
Flower
Female
Part of
the
Flower
WARM-UP:
MITOSIS VS MEIOSIS:
BUT WHERE?
• List at least five things you remember about
mitosis and meiosis.
• What type of cells does mitosis create?
And meiosis?
• Where do you think each process would
occur in a flower?
Meiosis in plants happens in the Ovule (for the
egg) and in the Anther (for the sperm)
Mitosis in plants happens in all of the other parts of
the flower
POLLINATION
• Size and shape of the flower helps pollination to
occur
• Cross Pollination:
• Self-pollination can also occur:
– Pollen is released from the anther and is
transferred to the stigma. A pollen tube forms and
grows through the style. The pollen tube reaches
an ovule within the ovary, where the sperm
fertilizes the egg.
POLLINATION LEADS TO
FERTILIZATION:
• https://s-media-cacheak0.pinimg.com/originals/db/fe/c2/dbfec2b304bdc6b267476b9ee9c66f9
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FRUITS
• Structures in which seeds develop
• Promote seed dispersal through the
digestive track of animals
ALL PLANTS DO IT…
ALTERNATION OF GENERATIONS
Haploid Gametes =
(1n)
= Diploid Gametes
(2n)
Alternation of Generations is the process in which
all plant life cycles include both haploid gametes
and diploid gametes.
ALTERNATION OF GENERATIONS
This allows the plant to grow from a zygote
into a mature organism, while also creating
both pollen and ovules.