Question

Threshing is a method of separation used to separate:
A) Two useful substances of the same size.
B) Harmful substances from the useful ones.
C) The useful substance from the non-useful one.
D) None of the above

Answer 1

Hint: The answer here is based on the concept of inorganic chemistry that deals with the separation techniques used to separate two or more substances from a mixture and this separation is based on the crops.

Complete answer:
The concepts of separation techniques used for the separation of one or more substances from the mixtures and also about the techniques used for the purification process.
Now, we shall see what threshing means and how the process is carried out.
- Basically the separation techniques are used for the separation of useful substances in which all the substances obtained after separation are useful or some among them may also not be useful.
- The method of threshing is mainly used for the separation of required crops that is to loosen the edible part of the grain from the straw to which the crop is attached.
- Threshing process is done by the mechanical work that is by beating the grain using a flail on the threshing floor where the useful part is being separated out.
- In this process, the useful substance that is the edible part is obtained from the non - useful part.
Some of the examples of threshing include threshing of rice, wheat, mustard seeds and these are basically used by the farmers.

Therefore, the correct answer is option C).

Note:
Note that the process of threshing does not remove the bran from the grain but instead it removes the edible part that is nothing but the useful part from the non – useful part and therefore it is the step in preparation of grain after reaping.