Choose the right answer from the four alternatives given below.
In which one of the following regions is extensive commercial grain cultivation not practised?
Option (D) is correct because Amazon Basin is the region where extensive commercial grain cultivation is not practised. Commercial grain cultivation is practised in the interior parts of semi arid lands of the mid latitudes. Amazon Basin is the largest tropical forest in the world. People practise shifting cultivation here.
Option (A) is not correct because American Canadian prairies experience dry semi arid climates with an annual precipitation of 12 to 15 inches which is suitable for commercial grain cultivation.
Option (B) is not correct because European steppes are the largest temperate steppe and experience semi arid climate which is best for commercial grain cultivation.
Option (C) is not correct because Pampas of Argentina is also semi arid region. Wheat is Argentina’s largest crop in harvested land area.