Transcript Ch. 27 * Reproduction in Flowering Plants

Ch. 30 – Reproduction in Flowering Plants
• Parts of a Flower
• 1. Petals – colorful
• 2. Sepals – usually green and below the
petals.
• 3. Receptacle – cup-like support for the
ovary.
• 4. Male Part  Stamen
–A. Anther – holds the pollen
–B. Filament – stalk that holds the
anther.
• 5. Female Part  Pistil
– A. Stigma – swollen opening for the
pistil. At the top and usually sticky.
Why?
– B. Style – stalk-like portion of the
pistil.
– C. Ovary – bottom portion, usually
round.
• Contains the egg.
Pollination
• What attracts insects to a plant besides its
color?
–Nectar
• 2 Types of Pollination
–1. Cross-pollination – transfer of pollen
from one plant to another plant of the
same species.
–2. Self-pollination – transfer of pollen
within the same plant.
Types of Fruit
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Grain  wheat
Pome  pear & apple
Berry  grape, tomato, blueberry
Legume  peas, soybeans
Drupe  cherry, peach, stone seeds
Aggregate fruit  strawberry, raspberry
Achene  sunflower seed
Samara  maple, ash, (helicopters)
Others  Table 32-1 (pg. 635)
Parts of a Seed
• Seed Coat – outer protection
• Radical – develops into a
primary root.
• Hypocotyl – grows upward
above ground into stems and
leaves.
• Cotyledon – provides food for
the seed.
• What is the male gametophyte called?
– Antheridium
• What is the female gametophyte called?
– Archegonium
• Meiosis – Reduction of division
–How gametes are produced
• Egg & sperm are produced by
meiosis.
• Mitosis – Cell division
–Vegetative growth
Life Cycle of Angiosperms
Microspores – are produced in the male cone, which
gives rise to a male gametophyte and eventually it will
develop into pollen.
Megaspores – are produced in the female cone, that
gives rise to the female gametophyte and eventually it
will grow into an egg cell (ovule).
Pollen (1N) + Ovule (1N) = Embryo (2N)
Haploid = 1N
Diploid = 2N
The embryo (seed) gets its food to grow from the
cotyledon.
Double fertilization occurs in flowering plants. This is
where 1 pollen fertilizes the 1st egg for a zygote and a
second pollen fertilizes an 2nd egg for the endosperm.