Discussion
Match each machine in List I with what it separates in List II.
List I
A. Thresher
B. Maize sheller
C. Decorticator
D. Winnower
List II
1. Kernels from the cob
2. Grain from the head and straw
3. Grain from chaff using air
4. Kernels from the shell
Select the correct match.
Answer: A
Correct answer: A-2, B-1, C-4, D-3
Each machine is matched to its separation. A thresher (A) separates grain from the head and straw (2); a maize sheller (B) separates kernels from the cob (1).
A decorticator (C) separates kernels from the shell (4), and a winnower (D) separates grain from chaff using air (3). The first three break a physical attachment; the winnower only sorts what is already loose, which is why it works on differences in terminal velocity rather than by any mechanical action.
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