Concept:Winnowing separates grain from lighter chaff using air or wind.Explanation:The illustrated operation shows the mixture of grains and chaff being tossed into the air.A winnowing basket or a winnowing machine is used for this purpose.The wind blows away the lighter chaff or husk, while the heavier grains fall back down.This process is usually done after threshing to clean the grains.Therefore, the farm operation shown in the diagram is winnowing.Answer:A. winnowing
