* Fertilized egg: This is the very beginning of a new plant. It contains the genetic material from both the male and female parts of the plant.

* Seed: The fertilized egg develops into a seed. The seed contains the embryo (the future plant) and a food source to nourish it until it can start photosynthesizing.

* Fruit: A fruit develops from the flower's ovary, often surrounding the seeds. It is not a direct result of the fertilized egg.

* Leaf: Leaves develop from the stem of the plant after the seed germinates.

So, the fertilized egg is the starting point for a seed, which then gives rise to the entire plant, including leaves.