Which flower part aids in the growth of fruits?

The ovary is the part of the flower that plays a crucial role in the growth of fruits. After fertilization occurs, the ovary develops into the fruit, housing the seeds formed from the fertilized ovules. This transformation is essential for the reproductive cycle of flowering plants, as fruits serve to protect the developing seeds and assist in their dispersal.

In contrast, the stamen is the male reproductive part of the flower responsible for producing pollen, which is essential for fertilization but does not directly contribute to fruit growth. The style is a slender stalk that connects the stigma to the ovary, facilitating the movement of pollen but not participating in the formation of the fruit itself. The stigma is the part of the flower that receives pollen during pollination, initiating the process that leads to fertilization, but it does not form part of the fruit structure. Therefore, the ovary is the correct answer, as it directly develops into the fruit following the fertilization of the ovules.