The process that is used to separate grain from stalks etc. is? 

One may pluck mangoes or guavas from the trees. But, grain seeds are much smaller than mangoes or guavas. So, plucking them from their stalks would be impossible. How does one separate grain seeds from their stalks? The process that is used to separate grain from stalks etc. is threshing. In this process, the stalks are beaten to free the grain seeds. Machines are also used to thresh large quantities of grain.