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Agricultural Science 1992 WAEC Past Questions

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6
The most important soil microorganism which are effective decomposers of wood in forest areas are
  • A. earthworm
  • B. wood beetles
  • C. termites
  • D. algea
  • E. fungi
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7
Which of the following is not a biotic factor affecting agricultural production?
  • A. predator
  • B. soil
  • C. parasites
  • D. pest
  • E. dieases
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8
The effect of clearing agricultural lands clean of all vegetation and or trees include the following except
  • A. exposure of soil to erosion
  • B. compaction of soil
  • C. desertification
  • D. complete removal of soil nutrients
  • E. exposure of subsoil
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9
Which of the following is not an advantage of drip-irrigation?
  • A. fertilizers can be applied through the system
  • B. there is reduction in the concentration of salt in the root zone
  • C. the system operates on a much lower line pressure than spinkler system
  • D. its efficiency on water distribution in steep slopes is poor
  • E. there is considerable maximization on use of water
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10
Chlorosis observed along the veins of leaves is a characteristic symptom for the deficiency of
  • A. nitrogen
  • B. magnesium
  • C. potassium
  • D. phosphorus
  • E. sulphur
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