Vascular seed plants Flashcards
Types of vascular seed plants
Angio and gymnosperms
Gymnosperm
Naked seed plants
Angiosperm
nonflowering plants
Two types of angiosperm
monocot and dicot
Vascular seed plants dominant generation
Sporophyte
Describe vascular seedless gametophyte
Reduced/microscopic, dependent on sporophyte
Sporousness of vascular seed plants
Heterosporous
What does the microspore in vascular seed produce
pollen grain
What does megaspore in vascular seed produce
Embryo sac
Where is pollen grain produced
Microsporangia of anthers
What are the components of the pollen grain
generative cell and tube cell
Components of ovule
Megasporocyte (2n) megasporangium (2n) = nucellus, integuments (2n)
Seed components
Sporophyte embryo, protective coat, food supply from endosperm
What component of xylem does gymnosperm have
tracheids
What component of xylem does angiosperm have
Tracheids and vessel elements
Derived traits of seed plants
Heterospory, seeds, pollen grains, ovules
What is the only gymnosperm group with vessel elemts
gnetophyta
Phloem in gymno
sieve cells
phloem in angio
sieve tube elements and companion cells
what do gymnos lack in terms of leafs flowers, petals, etc
lacks sepals and petals
Ovule in gymno
exposed
ovule in angio
protected by ovary
reproductive structure in gymno
unisexual
reproductive structure in angio
bisexual or unisexual
fertilization type of gymno
single
fertilization type of angio
double
does angio have archegonia
no bc it’s primitive
double fertilization
1 sperm cell fertilizes egg to give rise to zygote and the other sperm cell fertilizes either polar or central cells to give rise to endosperm
ploidy of endosperm in gymno
haploid
when does endosperm develop in gymno
prior to fertilization from archegonia
when does endosperm develop in angio
after fertilization
ploidy of angio endosperm
triploid
component and ploidy of embryo sac
n/haploid, 1 egg cell, 2 synergids, 3 antipodal cells, 2 polar nuclei
components of ovule
megasporangium (nucellus), haploid megaspore, integuments
how many integuments does gymno have
1
how many integuments does angio have
2