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Agricultural Science 2021 JAMB Past Questions

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71

Root-knot disease of tomato is caused by

  • A. virus
  • B. nematode
  • C. bacterium
  • D. fungus
View Answer & Discuss JAMB 2021
72

Callosobruchus maculates is a common pest of

  • A. maize
  • B. cowpea
  • C. rice
  • D. millet
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73

Gummosis disease of citrus is caused by

  • A. aphids
  • B. fungi
  • C. white flies
  • D. bacteria
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74

Which of the weeds is dispersed by wind?

  • A. pig weed (Boerhavia diffusa)
  • B. goat weed (Ageratum conizoides)
  • C. Hause thorns (Acanthospermum hispidum)
  • D. Tridax (Tridax procumbeus)
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75

The characteristic symptoms of mosaic disease of crops is usually observed on

  • A. roots
  • B. leaves
  • C. stems
  • D. fruits
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