Endosperm makes up about what percentage of the grain and is typically used in refined bread flour?

• A. 83% of the grain; Typically used in refined bread flour
• B. 50% of the grain; Used in whole grain products
• C. 30% of the grain; Used in animal feed
• D. 10% of the grain; Used in flour blends

Answer: (A)

The key idea here is understanding grain anatomy and how milling creates different flour types. The endosperm is the large central portion of the kernel that stores most of the starch and provides the energy source for the developing seed. When flour is refined to white flour, the milling process removes the bran (the fiber-rich outer layers) and the germ (the fat-rich embryo). What’s left—the endosperm—is ground into a fine, white flour that has a lot of starch and enough gluten-forming proteins to give bread dough its structure, texture, and rise. That’s why refined bread flour is made from the endosperm. The other parts of the grain—bran and germ—are used in whole grain products or in separate foods to add fiber, vitamins, and fats.