WAEC Agricultural Science questions

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

1. Question 81· Crop classification and propagation· WAEC

   Hybridisation in crop improvement means

   • Ausing no seeds
   • Bgrowing one variety only
   • Ccrossing two different varieties to combine good qualities
   • Dplanting old seeds

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2. Question 82· Crop classification and propagation· WAEC

   Plantain is propagated mainly by

   • Abudding
   • Bseeds
   • Cstem cuttings
   • Dsuckers

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3. Question 83· Crop classification and propagation· WAEC

   Joining a scion to a rootstock is called

   • Abudding with seeds
   • Blayering
   • Cgrafting
   • Dsowing

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4. Question 84· Crop classification and propagation· WAEC

   Which planting material is normally used to establish a new yam farm?

   • Astem cuttings
   • Btrue seeds
   • Csetts or small seed yams
   • Dsuckers

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5. Question 85· Crop classification and propagation· WAEC

   Grafting involves

   • Ajoining a scion onto a rootstock
   • Bplanting seeds
   • Cdividing tubers
   • Dburying a stem to root it

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6. Question 86· Crop classification and propagation· WAEC

   Crops that complete their life cycle in one growing season are

   • Aevergreens
   • Bbiennials
   • Cperennials
   • Dannuals

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7. Question 87· Crop classification and propagation· WAEC

   Which of these crops is a legume?

   • Acassava
   • Bmaize
   • Cyam
   • Dcowpea

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8. Question 88· Crop classification and propagation· WAEC

   Cassava is propagated mainly by

   • Agrafting
   • Bseeds
   • Csuckers
   • Dstem cuttings

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9. Question 89· Crop classification and propagation· WAEC

   Cocoa and oil palm are classified as

   • Acover crops
   • Bannual crops
   • Cbiennial crops
   • Dperennial crops

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10. Question 90· Crop classification and propagation· WAEC

    Coffee and tea, like cocoa, are classified as

    • Abeverage crops
    • Bfibre crops
    • Coil crops
    • Dlatex crops

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11. Question 91· Crop classification and propagation· WAEC

    Mass selection in crop improvement involves

    • Aspraying hormones
    • Bplanting all seeds
    • Ccrossing with animals
    • Dchoosing seeds from the best plants for the next planting

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12. Question 92· Crop pests and diseases· WAEC

    A pest is any organism that

    • Ahelps crops
    • Bdamages crops or stored produce
    • Cfixes nitrogen
    • Dpollinates flowers

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13. Question 93· Crop pests and diseases· WAEC

    Cassava leaves that are mottled yellow-green, twisted and stunted show signs of

    • Acassava mosaic disease
    • Bcassava bacterial blight
    • Croot rot
    • Drust

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14. Question 94· Crop pests and diseases· WAEC

    Biological control of pests involves

    • Ahand-picking only
    • Bspraying chemicals
    • Cburning the farm
    • Dusing natural enemies of the pest

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15. Question 95· Crop pests and diseases· WAEC

    Cocoa pods that turn brown-black and rot during wet weather show signs of

    • Ablack pod disease
    • Bswollen shoot disease
    • Ccapsid damage
    • Dleaf rust

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16. Question 96· Crop pests and diseases· WAEC

    The cassava mealybug was controlled in Nigeria largely by

    • Aburning all cassava
    • Breleasing a parasitic wasp
    • Cflooding farms
    • Dusing only herbicides

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17. Question 97· Crop pests and diseases· WAEC

    The insect that spreads cassava mosaic disease is the

    • Awhitefly
    • Bstem borer
    • Cweevil
    • Dtermite

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    Explanation and discussion

18. Question 98· Crop pests and diseases· WAEC

    Weevils mainly damage

    • Astored grains
    • Bgrowing leaves
    • Croots of trees
    • Dfish

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19. Question 99· Crop pests and diseases· WAEC

    Black pod disease of cocoa can be controlled by

    • Aflooding the farm
    • Bapplying urea
    • Cspraying copper fungicides and removing infected pods
    • Dspraying insecticide only

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20. Question 100· Crop pests and diseases· WAEC

    Aphids, which have piercing and sucking mouthparts, are best controlled with

    • Aa systemic insecticide
    • Ba stomach poison bait
    • Ca fungicide
    • Da herbicide

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