Read the following extract carefully and answer the questions that follow: Irrigating trees and fields This is an excerpt from the Babumana that describes the irigation devices the emperor observed in Northern India : The greater part of Hindustan country is situated ont leyel land. Many though its towns and cultivated lands are, it nowhere has running waters. For water is not at all a necessity in cultivating crops and orchards. Autumn crops grow by the downpour of the rains themselves, and strange it is that spring crops grow even when no rains fall. (However) to young trees water is made to flow by means of buckets or wheels.... In Lahore, Dipalpur (both in present-day Pakistan) and those other parts, people water by means of a wheel. They make two circles of rope long enough to suit the depths of the well, fix strips of wood between them, and on these fasten pitchers. The ropes with the wood and attached pitchers are put over the wheel-well. At one end of the wheel-axle a second wheel is fixed, and close to it another on an upright axle. The last wheel the bullock turns, its teeth catch in the teeth of the second (wheel), and thus the whel with the pitchers is turned. A trough is set where the water empties from the pitchers and from this the water is conveyed everywhere In Agra, Chandwar, Bayana (all in present-day Utar Peadesh) and those pacus agaia,-people water with a bucket. At the well-edge they sct up a fork of wood, having a roller adjusted between the forks, tie a rope to a large bucket, put the Iope over a roller, and tie its other end to the bullock One person most drive the balioclk another empty the bucket. What was the necessity of irrrigation ?