JAMB and WAEC Agricultural Science questions: Crop pests and diseases

39 questions with answers and explanations. Tap an option to check yourself.

1. Question 21· Crop pests and diseases· JAMB

   Which of these is a typical sign of a viral disease in plants?

   • Aknots on roots
   • Bmottling (mosaic) of leaves
   • Cchewed leaves
   • Da white powdery coating

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   Explanation and discussion

2. Question 22· Crop pests and diseases· WAEC

   Using resistant varieties is a method of

   • Aharvesting
   • Bland clearing
   • Cdisease control
   • Dirrigation

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   Explanation and discussion

3. Question 23· Crop pests and diseases· WAEC

   Weevils are major pests of

   • Afish ponds
   • Bgrowing cassava leaves
   • Cstored grains
   • Drubber trees

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   Explanation and discussion

4. Question 24· Crop pests and diseases· WAEC

   Cassava mosaic disease is spread mainly by

   • Aweevils
   • Baphids
   • Clocusts
   • Dwhiteflies

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   Explanation and discussion

5. Question 25· Crop pests and diseases· JAMB

   Capsids (mirids) on cocoa damage the plant by

   • Asucking sap and causing cankers on stems and pods
   • Beating roots
   • Cboring timber
   • Drotting seeds

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   Explanation and discussion

6. Question 26· Crop pests and diseases· JAMB

   Maize streak virus is transmitted by

   • Alocusts
   • Bmealybugs
   • Cweevils
   • Dleafhoppers

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   Explanation and discussion

7. Question 27· Crop pests and diseases· JAMB

   Cassava mosaic disease is caused by a

   • Afungus
   • Bvirus
   • Cbacterium
   • Dnematode

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   Explanation and discussion

8. Question 28· Crop pests and diseases· WAEC

   Crop rotation helps to control soil-borne pests because

   • Athe pests lose their host crop
   • Bit adds pesticides
   • Cit waters the soil
   • Dit kills all insects

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9. Question 29· Crop pests and diseases· WAEC

   Stem borers damage maize mainly by

   • Atunnelling inside the stems
   • Bsucking sap from leaves only
   • Ceating the roots
   • Dspreading viruses

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   Explanation and discussion

10. Question 30· Crop pests and diseases· JAMB

    The cocoa capsid (mirid) damages cocoa by

    • Asucking sap from young shoots and pods
    • Bboring into the roots
    • Ceating leaves only
    • Dspreading mosaic virus

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    Explanation and discussion

11. Question 31· Crop pests and diseases· WAEC

    Insects with piercing and sucking mouthparts include

    • Abeetles
    • Bgrasshoppers
    • Clocusts
    • Daphids

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    Explanation and discussion

12. Question 32· Crop pests and diseases· JAMB

    Black pod disease of cocoa is caused by a

    • Avirus
    • Bfungus
    • Cbacterium
    • Dmite

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    Explanation and discussion

13. Question 33· Crop pests and diseases· WAEC

    Rosette disease of groundnut is spread by

    • Aaphids
    • Bweevils
    • Clocusts
    • Dbeetles

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    Explanation and discussion

14. Question 34· Crop pests and diseases· JAMB

    The insect pest that bores into the stems of maize is the

    • Aaphid
    • Bweevil
    • Cstem borer
    • Dtermite

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    Explanation and discussion

15. Question 35· Crop pests and diseases· WAEC

    The variegated grasshopper damages crops by

    • Aboring stems
    • Bsucking sap
    • Ceating the leaves
    • Drotting roots

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    Explanation and discussion

16. Question 36· Crop pests and diseases· JAMB

    Root-knot nematodes cause

    • Aswellings (galls) on roots
    • Bleaf mosaic
    • Cpod rot
    • Dstem boring

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    Explanation and discussion

17. Question 37· Crop pests and diseases· JAMB

    Integrated pest management combines

    • Aseveral control methods to keep pests below damaging levels
    • Bonly chemical sprays
    • Conly biological control
    • Dno control

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18. Question 38· Crop pests and diseases· JAMB

    Grains in storage are mostly damaged by

    • Aweevils
    • Btsetse flies
    • Cticks
    • Dmosquitoes

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    Explanation and discussion

19. Question 39· Crop pests and diseases· JAMB

    Copper-based fungicides are sprayed on cocoa farms mainly to control

    • Ablack pod disease
    • Bcapsids
    • Cswollen shoot virus
    • Dweeds

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    Explanation and discussion