Angiosperm life cycle.
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<Li> Anthers   contain  microsporangia  which  produce  microspores  by
meiosis.
<Li> Microspores form male gametophytes (pollen grains) by mitosis.
<Li> Ovaries  contain  ovules where megasporangia produce megaspores by
meiosis
<Li> Megaspores form female gametophytes (embryo sacs) by mitosis.
<Li> After pollination, double fertilization occurs.
<Li> The diploid zygote develops into an embryo within a seed.
<Li> A  seed  uses  the  triploid endosperm as food to germinate into a
large sporophyte.
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