What is the main nutritional component of the grain’s endosperm?

The endosperm of a grain is primarily composed of starch, which serves as a major source of energy for the seed during germination. Starch is a polysaccharide that provides carbohydrates, which are essential for energy production in the body. This is why the statement about the endosperm being high in starch is correct.

While grains may also contain some fiber, vitamins, and minerals, these components are more concentrated in other parts of the grain, such as the bran and germ. For example, the bran is typically where most of the fiber is found, and the germ contains a variety of vitamins and minerals. Therefore, when focusing specifically on the endosperm, the predominant nutritional characteristic is its high starch content.