IBPS PO Prelims Model Paper 15

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Directions (Q. 46–48): In each of the following sentences, parts of the sentence are left blank. Beneath each sentence, five different ways of completing the sentence are indicated. Choose the best alternative from among the five options.
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Question : 46 of 100
 
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A conservation problem as important as that of soil erosion is the ______ of soil fertility. Most agriculture was originally supported by the ______ fertility of the soil; and, in areas in which soils were deep and rich in minerals, ______ could be carried on for many years without the return of any ______ to the soil other than those supplied through the natural ______ of plant and animal wastes.
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