Final answer:
The ovary wall of a developing seed becomes the pericarp, which is the part of the fruit enclosing the seed.
Step-by-step explanation:
As the seed develops, the ovary wall becomes the pericarp. The pericarp is a collective term that describes the exocarp, mesocarp, and endocarp, which together enclose the seed and become a part of the fruit. During the transformation of an ovule into a seed, the integuments that originally protect the megasporangium develop into the seed coat, a rigid outside coating of the seed. However, it is the ovary wall that transforms to form the pericarp, while endosperm is the tissue that serves as a food reserve for the developing embryo, and the nucellus is a feature of the fully developed seed in some groups.