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15 Cards in this Set

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formation angiosperm gametes
characterized by alt. of generations
diploid sporophyte to haploid gametophyte.
M. and F. struct. occur together on ind. flower
not permanent parts of adult individual.
microgametophytes
pollen grains. Male gametophytes
megagametophyte
female gametophyte
embryo sac
pollen formation
pollen sac has specialized chamgers inclosing microspore mother cells. Meiosis form four haploid microspores. grain shapes specialized for spec. flower species
embryo sac
megaspore mother cell found w/in ea ovule. meiosis produce four haploid megaspores. usually one survives and other 7 absorbed by ovule. single megaspore mitosis to prod. 8 haploid nuclei in embryo sac
pollination
pollen placed on stigma.
pollination
butterflies, moths, birds, bees.
birds-red colors atract birds. Carotenoids attract insects UV light.
bats, rodents, monkeys, wind.
wind pollinated angiosperms
sm greenish odorless flowers w/ reduced or absent corollas. grouped in lg numbers and hang down in tassels.
self pollination
do not need visited by animals and produce attractants.
produce uniform progeny
dioecious
produce only ovules or only pollen on single ind.
monoecious
Pollen and ovules on same plant
dichogamous
functional stamens and pistils present on same plant but mature at different times.
self pollination
self incompatibility results when pollen and stigma recog. ea. other as genetically related and pollen tube growth is blocked.
life span
once established, plants lived varied life spans.
span may or may not correlate w/ reprodu. strategy.
Woody plants have extensive secondary growth.
biennial plants
life cycles take two years.
photosynthate stored underground during first year.
flowering stems produced 2nd year