Question

which machine is sed for the seprations of grains from stalk

Answer 1

@ Hii friend @
============
Your answer is Thresher machine.
Thresher machine is used to separate grain from stalk.
Nowadays, these machines are very well developed for easier to use.

You can have a look for the modern Thresher machine, in the above pic.

Hope it will help you!
Thanks dear!
============