Which technique involves throwing the mixture into the air so that the wind blows away the lighter chaff, while the heavier grains fall back down for recovery?
Options:
A .  
Threshing
B .  
Sieving
C .  
Handpicking
D .  
Winnowing
Answer: Option D : D In winnowing, the mixture is tilted slowly from some height. Thus, the heavier element slides down while the lighter element is flown out by the action of wind.
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