In the carbon cycle, atmospheric carbon dioxide is replenished by

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Streak disease of maize is caused by

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Physical properties of clay soil include

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Which of the following factors is both a physical and a chemical agent of rock weathering?

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High temperature and pressure convert sandstone to

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Which of the following groups of crops grow best in the savanna zones of West Africa?

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The removal of top soil from a small area of soil surface due to the impact of raindrops is known as

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The biotic factor which derives much benefit from livestock and reduces productivity is a

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Which of the following practices promote agricultural development?

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The main reason for establishing game reserves is to prevent wildlife from

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Which of the following is not a role of government in agricultural production?

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The most common grazing system in West Africa is

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