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Agricultural Science 2016 WAEC Past Questions

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26
Pure line of crops are produced through continuous
  • A. selection
  • B. hybridization
  • C. cross breeding
  • D. inbreeding
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27
Which of the following insects transmits swollen shoot virus of Cocoa?
  • A. Stem borer
  • B. Mealybug
  • C. White fly
  • D. Capsid
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28
Quarantine regulations are established so as to
  • A. allow the importation of diseased plant and animal materials
  • B. prevent the introduction foreign diseases into country
  • C. assist farmers to grow foreign crops
  • D. facilitates the rapid spread of foreign diseases
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29
The most effective method of controlling viral diseases in crops is by
  • A. spraying with bordeaux mixture
  • B. renoving and burning affected crops
  • C. practicing crop rotation
  • D. planting at recommended spacing
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30
The use of parasites and predators to control weeds is referred to as
  • A. biological control
  • B. chemical control
  • C. cultural control
  • D. mechanical control
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