What plant structure changed to produce a giant zucchini?

The plant structure that changed to produce a giant zucchini is the fruit, specifically the ovary of the flower. Through selective breeding and cultivation practices, growers have encouraged the zucchini plant (Cucurbita pepo) to develop larger and more elongated fruits. This can involve manipulating factors such as nutrient availability, water supply, and genetics to enhance growth. As a result, the zucchini can reach sizes much larger than its typical counterparts.