Multiple choice

Which of the following method(s) is/are used to separate impurities from wheat commercially?

  1. Handpicking and sieving

  2. Threshing and handpicking

  3. Sieving only

  4. Threshing and sieving
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Impurities in wheat vary in size. On the commercial scale, impurities like husk and stones are removed before grinding wheat by pouring it on a slanting sieve. This removes the pieces of stones, stalk and husk that may still remain after threshing and winnowing. So, apart from winnowing, the two methods are threshing and sieving. 

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