Angiosperm life cycle.

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

    Review and exercise: