What causes an ovary to develop into a fruit?

The development of a fruit from an ovary is triggered by a process called fertilization. When pollen from the male anther fertilizes the ovule in the female ovary, it leads to the formation of a zygote. This zygote then develops into an embryo, which is the first stage of a new plant. The fertilized ovary begins to swell and mature, and its tissues transform into the various components of the fruit. The ovules develop into seeds, while the ovary wall thickens and takes on the characteristics of the fruit, such as color, flavor, and texture. The development of the fruit thus serves as a protective and nourishing environment for the growing seeds.