Transcript Unit 7--Plants - DigitalWebb.com

Unit 7--Plants
Chapter 24
Reproduction in Seed
Plants
p. 536
Flower Parts
(non-essential)
• Sepals (outermost, leaf-like)
for protecting inner parts
– Calyx = all sepals together
• Petals (colorful, with nectar)
to attract
pollinators
patterns in
which see different
ultraviolet light
– Corolla = all petals together
What we see…
NECTER GUIDES
What they see:
What we see…
What they see:
What we see…
What they see:
Flower Parts (essential)
–Stamens (male reproductive
organs)
• filaments = slender stalk supporting…
• anther = produce pollen (containing sperm)
–Pistils (female reproductive organs)
• stigma = sticky top to catch pollen
• style = slender stalk supporting…
• ovary = base contains ovules -> eggs &
later houses seeds
Fruit = ripened ovary & associated parts
Flower
to Fruit
After Pollination…
Petals & stamens dry
and fall off
Within ovary, seeds
develop in ovules…
Ovary becomes “core”
of the apple
Receptacle swells
around ovary…
Receptacle becomes
fleshy part of fruit
Sepals dry, but
don’t fall off…
Calyx forms “crusty”
bottom of apple
ovary cross section showing ovules
Fruit = for seed dispersal
Seeds
• Seed coat =
to protect embryo (softens when wet)
• Nutrients = endosperm (monocots)
& fleshy cotyledons (dicots)
• Embryo plant (attached to cotyledon)
– radicle = embryonic root
– hypocotyl = embryonic stem
– epicotyl = embryonic shoot (or bud)
– plumule = embryonic leaves
(leaves)
Epicotyl
(shoot)
Hypocotyl
(stem)