Agriculture in India : Food Crops — Geography STD 10 — Question

Threshing : It is a process of separation of food grains from the straw to which it is attached. It's done either by trampling under feet of bullocks or by machines.
Winnowing : Winnowing is a process by which chaff is separated from grain. It can also be used to remove pests from stored grain. It's done by blowing air through grain.