Answer with Explanation:
Wheat grains are turned into flour through three processes: Screening, Cleaning and Milling. This allows wheat to be used for several food purposes.
Firstly, the wheat is screened for small parts that cannot be eaten. These are then removed. Such parts include metal objects, stones, oats, etc. Then, it is cleaned thoroughly by lifting off dust. It is also conditioned with water in order to soften its outer layer. This will hasten the removal of the endosperm during the milling process.
Grains are then grounded and separated through milling. This breaks the grains which allows them for sifting and the process is repeated in order to achieve consistency. This also allows the separation of the wheat germ (embryo of the seed), endosperm (tissue) and bran (outer layer of the wheat kernel).
Whitest flours are produced from first and second break sifters. As the process is repeated, the color of the flour gets less whiter.
Thus, this explains the answer.