Answer:
provides food for embryo
Step-by-step explanation:
The structure marked with an X in the figure below is called a stored nutrient reserve.
The seeds are basically formed by an integument (outer part, a stored reserve and the embryo (it is in the center of the seed), the embryo is the main creator of a new plant, for that, it needs a high load of nutrients that is provided by the nutrient reserve. In addition, the stored nutrient reserve protects the embryo from external factors such as solar radiation and freezing.