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Agricultural Science 1990 WAEC Past Questions

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6
The major factor influencing the physical or mechanical breakdown of rocks into finer particles include the following except
  • A. man
  • B. animal
  • C. wind
  • D. water
  • E. solution
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7
Which of the following nutrient element is a macro-nutrient?
  • A. phosphorus
  • B. zinc
  • C. iron
  • D. manganese
  • E. boron
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8
Which of the following is a disadvantage of using organic manure on the soil?
  • A. spreading of pests and diseases
  • B. reducing the rate of evaporation from soil surfaces
  • C. improving the nitrogen content of soil
  • D. increasing the humus content of soil
  • E. preventing erosion and leaching
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9
Which of the following factors is not considered in 5the use of irrigation?
  • A. weed seed distribution over the farm
  • B. cost of maintenance
  • C. availability of water
  • D. build up of pests and diseases
  • E. prevention of salt accumulation through adequate drainage
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10
By which of the following ways is the agricultural production in Nigeria affected by topography
  • A. lowering of crop quality
  • B. determining the manure requirement of a farm
  • C. lowering the leve of production
  • D. increasing the pest incidence on crops
  • E. influencing the area of land, actually available for agriculture
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