What part of a seed holds the food / energy

Answer: Cotyledons

Explanation: Inside of the seed would be a tiny plant called the embryo. The two large parts of the seed are called the cotyledons. The cotyledons are stored food that the young plant will use while it is growing.

Answer: Endosperm

Explanation:

The endosperm is the tissue where food is stored, it surrounds the developing seed of flowering plants and provides nourishment to it.

The endosperm develops from the male gamete that fuses with another cell named the polar nuclei, and is usually triploid (with three sets of chromosomes)