Seed Plants Flashcards
Describe gymnosperms
seeds are totally expossed or borne on the scales of cones
ovary wall does not surround the ovules
Describe angiosperms
flowering plants
produce seeds within a fruit (a mature ovary)
Gymnosperms are ___plants
vascular
Gymnosperms produce_____.
seeds
List the 4 phyla of gymnosperms
coniferophyta
ginkgophyta
cycadophyta
gnetophyta
What is the largest phylum of gymnosperms?
coniferophyta
Most conifers are ____and_____
evergreen
monoecious
Monoecius
male and female reproductive parts in separate cones on same plant
Pinus
pine tree
What stage is a pine tree?
sporophyte
What stage is a pine seed in?
gametophyte
A pine tree is heterosporous
k
Where does a pollen tube grow from?
pollen grain
What does the pollen tube grow through? To get to what?
megasporangium
egg
Comon name for cyadophyta
cycads
Cycads are ___or____ in appearance
palmlike
fernlike
Cycads are dioecious. Meaning what?
male and female reproductive structures are on separate plants
Cycads reproduce with _____and seeds in _____ structures.
pollen
conelike
Give an example of a Ginkgophyta
Ginkgo biloba (only surviving species)
Ginkgo biloba is a deciduous, dioecious_____
tree
Female gingko produces fleshy ___directly on branches.
seeds
Gnetophytes share some traits with what?
angiosperms
List the three genuses of gnetophytes. Give xamples.
Gnetum- tropical vines, shrubs, trees with broad leaves
Ephedra- shrubs and vines that grow in deserts and other dry areas
Welwitschia- single species found in African desserts
Ephedra plants make ephedrine. Which does what?
stimulates the heart and raises blood pressure
