Bio Final: Angiosperms(4)
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What are theparts of the stamen?
__is the microsporangium.
What's produced inside are the __, which go into the __.
How many cells? Explain.
two cells; can't reduce anymore
generative turns into sperm
tube cell that develops into pollen tube
Pollen isgoing to end up where?
What isthere not much of?
on the stigma
not much cytoplasm
Explain the ovules.
has integuments, megasporangium, megasporocyte, which divides by meiosis to form four megaspores, three of which will disintegrate.
Female gametophyte has very different structure.
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)
Continuewith the female gametophyte.
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 as the ovule is developing?
what happens is that what comes in is a pollen tube that will digest through the megasporangium
How many sperm are used? For what?
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
Origin of stored food differs from pine tremendously. How.
not a female gametophyte that forms at all
Pollen tube gorws into ovule taht, if you're talking about an ovary with 100 seeds, what happens?
one pollen tube per ovule-->100 pollen tubes for 100 ovules
an enlarged ripened ovary
What does a fruit form from?
the only group of plants that make true fruits are the flowering plants; there are seeds inside
Majority offruits are__. Explain
cancome from simple and compound pistils
can have seeds
we never eat dry fruit
Other type ofFruits?
we eat these
What would you like to do?
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