What is the primary nutrient found in the endosperm of the grain?

The primary nutrient found in the endosperm of the grain is carbohydrates. The endosperm serves as the main storage tissue in seeds and is rich in starch, which is a complex carbohydrate. This starch provides energy when consumed, making it a crucial component of human diets.

In grains, the endosperm also contains some proteins, but not in the same high quantity as carbohydrates. Vitamins are typically more concentrated in the germ and bran of the grain, rather than in the endosperm. Fiber is primarily found in the bran layer of whole grains. Thus, while the endosperm contributes to the overall nutritional profile of grains, carbohydrates are its most significant nutrient.