Two clades of seed plants
Gymnosperms and angiosperms
What is a seed?
plant embryo packaged with a food supply and protective coating
pines and conifers
reproductive structure that bears seeds within ovaries
gametophytes in seed plants
highly reduced, microscopic
sporangia of seed plants
heterosporous; megasporangia and microsporangia
tissues protecting megasporangium
fertilized egg develops into...
diploid sporophyte embryo, which then develops into a seed
microspores released from microsporangium
tough coat covering pollen grains
pollen grains carried by wind or animals until they land near ovule
what pollen grain elongates into ovule to deliver sperm
reproductive structure consisting of a cluster of specialized leaves called sporophylls
seeds of gymnosperms
"naked;" develop on surfaces of sporophylls
two types of conifers
gametophytes of conifers
heterosporous; small pollen cones and larger ovulate cones
sperm of gymnosperms
do not have flagella
embryo (new sporophyte) and food supply derived from gametophyte tissue
flowers and fruits
phylum of angiosperms; two classes
Anthophyta, monocots and dicots
pore in the ovule where pollen tube releases sperm cells
two sperm cells: one fertilizes egg and other fuses with two haploid to form triploid cell that will produce endosperm
rudimentary root and one or two seed leaves of angiosperm embryo
where food is stored for developing endosperm
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see this FAQ.