3. Angiosperms (flowering plants)
• Plants that protect their seeds within the body
of a fruit.
• Make up ¾’s of all plants, including:
– Trees, shrubs, herbs,
grasses, water plants…
4. What is a fruit?
• Orange tree?
• Avocado tree?
• Pumpkin plant?
• Zucchini plant?
• Tomato plant?
5. Structure of a Flower
Page 138 Life Science Text 1. Pistil
2. Stigma
3. Style
4. Ovary
5. Stamen
6. Filament
7. Anther
8. Petal
9. Sepal
10. Receptacle
11. Stem
6. The Stamen:
Male Reproductive Structure
Consists of two parts:
Anther and Filament
The filament is a stalk
that supports the anther
The anther is where
meiosis occurs to
produce haploid pollen
Each pollen grain
contains sperm cells.
7. The Pistil:
Female Reproductive Structure
Consists of the stigma,
style and ovary
The sticky stigma
receives the pollen
from the anther
The pollen grows a
tube down through the
style
Meiosis occurs in the
ovary to produce
haploid ovules
Each ovule contains
an egg cell.
10. Pollination
Wind, insects or other
animals transfer pollen
from the anther of one
flower to the stigma of
another
Flowers vary
depending on
pollination mechanism
11. Pollination Vectors
Wind Pollination: Dull, scentless
flowers with reduced petals
Bees/Butterfly Pollination: Bright
color, nectaries, scent.
They sip nectar, get pollen on coats,
transfer pollen from flower to flower
Bird Pollination: Nectaries, bright
colors, tube-like flowers
Moth Pollination: White petals,
open at night
Fly Pollination:Rank odor, flesh
colored petals
12. • Pollen Grain • Anther Sac
Pollen grains contain two haploid cells produced through
meiosis.
1- The Tube cell – will grow the pollen tube.
2- The Generative cell – will go through mitosis to create
two sperm cells.
14. Seed and Fruit Development
After fertilization,
the petals and
sepals fall off
flower
Ovary “ripens”
into a fruit
The ovule
develops into a
seed
See Fig 13 on page 139 Life
Science Text
15. Seed Dispersal Mechanisms-
Allow plants to colonize new areas and avoid
shade of parent plant
Wind Dispersal - Flight mechanisms,
like parachutes, wings, etc.
Ex. Dandelion, maples, birch
Animal Dispersal - Fleshy fruits which
animals eat, drop undigested seeds in
feces or burrs which stick to
animals’ coats
16. Gravity Dispersal -
Heavy nuts fall to
ground and roll
ex. acorns
Water Dispersal - Plants
near water create floating
fruits
ex. coconuts