Discussion
Match each by-product in List I with the constituent that gives it value in List II.
List I
A. Rice husk ash
B. Oilseed cake
C. Wheat bran
D. Maize germ
List II
1. Protein
2. Amorphous silica
3. Oil
4. Dietary fibre
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Each by-product is matched to the constituent that gives it value. Rice husk ash (A) is valued for its amorphous silica (2); oilseed cake (B) for its protein (1), concentrated by the removal of the oil.
Wheat bran (C) is valued for its dietary fibre (4), and maize germ (D) for its oil (3), which is about a third of the germ's mass. In every case the outlet follows from whichever constituent happens to be unusually concentrated in that fraction.
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