The structure of a plant that produces the fruit is the ovary.

Here's why:

* Flowers: Fruits develop from the flower of a plant.

* Ovary: The ovary is the part of the flower that contains the ovules (which will become seeds).

* Fertilization: When pollen from the anther of a flower reaches the stigma, it travels down the style to the ovary. This fertilization triggers the ovules to develop into seeds.

* Fruit Formation: As the seeds mature, the ovary wall (also known as the pericarp) develops into the fruit. The fruit helps protect the seeds and often plays a role in seed dispersal.

So, the ovary is the key component in the production of a fruit.