Numerical answer
Five sentences related to a topic are given below. Four of them can be arranged into a coherent, meaningful paragraph, while one does not fit. Identify the sentence that does NOT fit (enter only the sentence number).
1. Crop rotation, the practice of growing different crops sequentially on the same land, helps prevent the soil nutrient depletion that results from repeatedly planting a single crop.
2. Farmers have practiced crop rotation for millennia, though the underlying soil chemistry was only understood much later.
3. Legumes are particularly valued in rotation cycles because certain bacteria in their root nodules convert atmospheric nitrogen into a form usable by plants.
4. Modern fertilizer production, by contrast, relies on an industrial process that synthesizes ammonia from nitrogen and hydrogen gas under high pressure.
5. This natural replenishment reduces the need for external fertilizer, making rotation an economically and ecologically attractive practice.
1. Crop rotation, the practice of growing different crops sequentially on the same land, helps prevent the soil nutrient depletion that results from repeatedly planting a single crop.
2. Farmers have practiced crop rotation for millennia, though the underlying soil chemistry was only understood much later.
3. Legumes are particularly valued in rotation cycles because certain bacteria in their root nodules convert atmospheric nitrogen into a form usable by plants.
4. Modern fertilizer production, by contrast, relies on an industrial process that synthesizes ammonia from nitrogen and hydrogen gas under high pressure.
5. This natural replenishment reduces the need for external fertilizer, making rotation an economically and ecologically attractive practice.
Show answer and solution
Answer: 4
Sentences 1, 2, 3 and 5 form a coherent paragraph about crop rotation and its benefit of natural nitrogen replenishment via legumes. Sentence 4, which describes the industrial synthesis of fertilizer, introduces an unrelated contrast that does not develop the crop-rotation narrative and is therefore the odd one out.
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