Bio Final: Angiosperms(4)

anther

filament

connective

pollen sac

microspores

pollen grain

two cells; can't reduce anymore

generative turns into sperm

tube cell that develops into pollen tube

on the stigma

not much cytoplasm

has integuments, megasporangium, megasporocyte, which divides by meiosis to form four megaspores, three of which will disintegrate.

nucleus of the megaspore begins to divide

functional megaspore is haploid; nucleus divides by mitosis (no cytokinesis) so it continues to divide until there are eight haploid nuclei

a cell wall eventually forms around each cell until there are sevel cells only (really greatly reduced amount of cells)

three cells (antipodals) may be all that's left of the female gametophyte

no archegonium in the place where the synergids are (suggestion: synergids are what's left of the archegonium)

what happens is that what comes in is a pollen tube that will digest through the megasporangium

both sperm are used; its a process unique to them; double fertilization

one fuses with egg;the otherfuses with the two nuclei that are polar to form a 3n structure that becomes the primary endosperm, whcih is triploid, and will develop into the stored food

not a female gametophyte that forms at all

one pollen tube per ovule-->100 pollen tubes for 100 ovules

an enlarged ripened ovary

a flower

the only group of plants that make true fruits are the flowering plants; there are seeds inside

dry

cancome from simple and compound pistils

can have seeds

we never eat dry fruit

fleshy 

we eat these