Transcript Group 3: Seed producing, Vascular Plants

Gymnosperms
Seed Advantages
• 1) Seed plants don’t
depend on water to
reproduce
– Pollen spread by wind
and animals
• 2) Embryo has….
– Nourishment:
Nutrients inside feed
embryo
– Protection: Hard shell
• 3) Seeds allow for
dispersal
– Carried by wind,
water, animals
Some seeds have “wings”
Some seeds are carried
by wind
Some seeds are carried by animals
Helicopter seeds
Helicopter seeds falling 9 stories
Group 3: Seed producing, Vascular Plants
• Type 1: Gymnosperms
• Needle-like leaves (reduces
water loss)
• Common to lumber industry
• Seeds enclosed in cones
– Male cones: produce
pollen
– Female cones: produce
eggs
• Zygote hardens into seed
(protected inside cones)
• Ex: Evergreen, Pine,
Redwood, Cedar
Gymnosperm Life Cycle
1) Male and female seed cones grow on adult sporophytes
Let’s zoom
into the
cones of this
sporophyte
tree.
Male cones
Female cone
2) Pollen (male gametophyte) released from the male seed cones.
Female eggs become fertilized
Zygote created inside the female cones
Male cones make pollen
Female cones make eggs
zygo
egg
te
zygo
egg
te
zygo
egg
te
zygo
egg
te
seed
seed
seed
seed
3) Seeds begin to harden inside the female cones
4) Seeds often spread
by wind
“wing” helps seeds spread
greater distance
5) Seed will land
ground
6) Seedling grows into (sporophyte)…the cycle repeats
ground
Kobe Kuiz
1)
2)
3)
4)
5)
Name three advantages of seeds.
Which structure will protect gymnosperm seeds?
What do male cones produce?
What do female cones produce?
What is created when the sperm and egg fuse:
sporophyte or gametophyte?