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Agricultural Science 1989 WAEC Past Questions

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11
Which of the following is not an effect of burning on the soil?
  • A. increasing the organic matter in the soil
  • B. increasing the soil nutrients
  • C. increasing the acidity of the soil
  • D. exposing the soil to erosion
  • E. sterilization of the soil
View Answer & Discuss WAEC 1989
12
The function of soil micro-organisms include the following except
  • A. decomposition of dead plant and animal remains
  • B. recycling of nutrients
  • C. causing plant or animal diesases
  • D. living as parasites on crop plants
  • E. filtration of soil water for plant use
View Answer & Discuss WAEC 1989
13
Slate is derived from
  • A. schist
  • B. sandstone
  • C. shale
  • D. gneiss
  • E. quartzite
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14
The following are advantages of the sprinkler method of irrigation except
  • A. rate of application of irrigation water can be controlled
  • B. portable nature of many sprinkler system make them suitable for use
  • C. the sprinkler system can be made automatic
  • D. method can be where topography affects horrowing of land
  • E. method may be difficult for local farmers to use
View Answer & Discuss WAEC 1989
15
Rhizobium supplies nitrogen to leguminous plants by
  • A. changing some mineral salts to sulphate of ammonia
  • B. incoporating urea into its body
  • C. fixing atmospheric nitrogen
  • D. decomposing plant remains
  • E. increasing the PH value of the soil
View Answer & Discuss WAEC 1989
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