Angiosperm life cycle.

1. Anthers contain microsporangia which produce microspores by meiosis.

2. Microspores form male gametophytes (pollen grains) by mitosis.

3. Ovaries contain ovules where megasporangia produce megaspores by meiosis

4. Megaspores form female gametophytes (embryo sacs) by mitosis.

5. After pollination, double fertilization occurs.

6. The diploid zygote develops into an embryo within a seed.

7. A seed uses the triploid endosperm as food to germinate into a large sporophyte.

Review and exercise: