Jhum farming is also referred to as slash and burn agriculture.

Concept: Farming is the practice to grow crops and rearing animals as a source of one’s livelihood. Jhum farming is also referred to as slash and burn agriculture.

Jhum farming is a type of farming in which the weeds that grow and infest a piece of land are not removed but the entire land is burned and the ash that is formed is mixed with soil to increase its nutritional value. In this type of farming, the seeds are sown in hollow trenches. The seeds that are sown here are not of a single category but they are of mixed variety. Some of the advantages of this type of farming are that the ashes that are formed increase the fertility of the soil and the productivity per area of the land is much higher because various types of crops can be grown in a small area. 

Therefore the given statement is true. Hence, the correct answer is option A.