Gymnosperm life cycle.

  1. Sporophytes bear cones.

  2. Pollen cones contain microsporangia.

  3. Ovulate cones contain megasporangia.

  4. After pollination, a megaspore develops into a female gametophyte.

  5. The pollen grain germinates a sperm cell which fertilizes an egg.

  6. The ovule becomes a seed.

Review and exercise: