gymnosperm Flashcards
1
Q
What is gymnosperm?
A
conifers, cycads, Ginkgo, and gnetophytes
- > pollen comes from pollen cones
- > seeds are cone like
- > first ones to have seeds
2
Q
cycads
A
once extreamly common
- > palm tree like, with the trunk and leave pattern
- >
3
Q
LC of zamia
A
type of cycad
- > dioacious
- > sporophyte dom
- > f larger then m cone
- > pollen dispersed thorugh air to enter ovule
- > sperm produced is FLAGILATED
- > fertilized cone and seeds ofter bright to attract animals
4
Q
Ginkgos
A
the dino trees, not much as changed
- > hard to find in wild
- > mostly all m since f smell
- > deciduous (drops leaves in winter)
- >
5
Q
LC of Ginko
A
- > pollen cones are grown laterally
- > pollen arives at ovules and polenates it in spring
- > pollen tube forms in late spring to fertilize
- > BAMN now u gotta seed to produce sporophytes
6
Q
conifers
A
- > my lovely pine trees
- > 1st seed plant to dominate
- > Mostly monoecious
- > seed cones can look like berries
7
Q
pine tree (pinus) LC
A
- > pollen cones at the bottom, ovulate cones at the top
- —-> Limits self-fertilization
- > pollen enters ovule, but doen’t fertilize till later(18months)
- > seeds then fall off cons and disperse via wind due to wing-shaped seeds
8
Q
gnetophytes
A
the weird gymnosperm
- > bush-like doesn’t grow tall
- < ambiguous DNA
