The method of soil conservation in which ploughing is done parallel to the contours of a hill slope to form a natural barrier for water to flow down the slop is called?
In the following question, four number pairs are given. The number on left side of (–) is related to the number of the right side of (–) with someLogic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives