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Agricultural Science WAEC Past Questions

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631
Gummosis disease of citrus is caused by
  • A. aphids
  • B. fungi
  • C. white flies
  • D. bacteria
View Answer & Discuss WAEC 1999
632
Which of the following weeds is dispersed by wind?
  • A. pig weed (boerhavia diffusa)
  • B. goat weed (ageratum conizoides)
  • C. hausa throns (acanthospermum hispidum)
  • D. tridax (tridax procumbens)
View Answer & Discuss WAEC 1999
633
The characteristic symptoms of mosaic disease of crops is usually observed on
  • A. roots
  • B. leaves
  • C. stems
  • D. fruits
View Answer & Discuss WAEC 1999
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634
The correct sequence in the processes of crop improvement is
  • A. introduction-slection-breeding
  • B. breeding-selection-intruduction
  • C. breeding-introduction-selection
  • D. introduction-breeding-selection
View Answer & Discuss WAEC 1999
635
A condition which a gene does manifest observation characteristics in the presence of its dominant allele is known as
  • A. dominance
  • B. mutation
  • C. recessiveness
  • D. homozygosity
View Answer & Discuss WAEC 1999
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