Answer:
The structure that develops within the reproductive leaves of a seed plant and contains the female gametophyte is called the ovule.
Step-by-step explanation:
The ovule is the precursor to the seed, and it contains the female reproductive cells of the plant, including the egg cell.
After fertilization, the ovule develops into a seed, which contains an embryo and a food source for the developing plant.
The ovule is an important part of the reproductive system of seed plants, including gymnosperms and angiosperms.