Describe the post-fertilization changes in a flower.

Explanation

**Step-by-Step Solution:**

1. **Fertilization Process**: The process of fertilization in flowers involves the fusion of male and female gametes, resulting in the formation of a diploid zygote. This is the starting point for post-fertilization changes.

2. **Zygote Development**: After fertilization, the zygote undergoes repeated mitotic divisions. This process leads to the development of an embryo from the zygote.

3. **Formation of Seed**: The fertilized ovule transforms into a seed. The seed contains the developing embryo, which is crucial for the future plant.

...