Question
What are the commonly used techniques used by farmers in villages to purify food grains?
Solution
Farmers generally use the following techniques:
(i) Winnowing: It is the method of separating lighter husk from grain with the help of air.
(ii) Hand-picking. The method of hand-picking is used to separate undesirable components from the mixture such as small pieces of stones, husk, grain from wheat, rice and pulses.
(iii) Sieving. It is the processes of separating particles of different sizes by allowing them to pass through sieve having different hole sizes.
