JAMB Agricultural Science questions

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

1. Question 161· Forestry· JAMB

   Cutting only selected mature trees while younger ones are left to grow is

   • Ataungya
   • Bclear felling
   • Cafforestation
   • Dselective exploitation

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   Explanation and discussion

2. Question 162· Forestry· JAMB

   Gmelina and teak are planted widely in Nigeria for

   • Afood
   • Btimber and poles
   • Coil
   • Dlatex

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   Explanation and discussion

3. Question 163· Forestry· JAMB

   The taungya system involves

   • Acutting all the trees in an area
   • Bplanting trees on bare land only
   • Cgrowing food crops between young forest trees
   • Dgrazing animals in forests

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4. Question 164· Forestry· JAMB

   Which of these is a non-timber forest product?

   • Ateak poles
   • Biroko planks
   • Choney
   • Dmahogany logs

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   Explanation and discussion

5. Question 165· Forestry· JAMB

   The planting of trees on land that has never had forest is

   • Areforestation
   • Bdeforestation
   • Cafforestation
   • Dagroforestry

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   Explanation and discussion

6. Question 166· Forestry· JAMB

   Forests can be regenerated by

   • Aburning the forest
   • Bplanting seedlings after felling
   • Covergrazing
   • Dclearing land for crops

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7. Question 167· Forestry· JAMB

   Gmelina is widely planted in Nigeria for

   • Apulpwood and timber
   • Bfood
   • Crubber
   • Dfibre for textiles

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   Explanation and discussion

8. Question 168· Forestry· JAMB

   Shelterbelts are rows of trees planted to

   • Areduce wind speed and protect crops
   • Bprovide latex
   • Cattract locusts
   • Ddrain swamps

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9. Question 169· Husbandry of field crops· JAMB

   Groundnut is harvested when

   • Apods are still white and soft
   • Bflowers first open
   • Cseedlings emerge
   • Dleaves turn yellow and pods are mature

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10. Question 170· Husbandry of field crops· JAMB

    Cocoa pods are ready for harvest when

    • Athey change colour from green to yellow or red
    • Bthey fall to the ground
    • Cflowers appear
    • Dleaves are shed

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11. Question 171· Husbandry of field crops· JAMB

    Planting two or more crops on the same piece of land at the same time is

    • Amonocropping
    • Bmixed cropping
    • Ccrop rotation
    • Dshifting cultivation

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12. Question 172· Husbandry of field crops· JAMB

    Planting crops too close together leads to

    • Acompetition and lower yield per plant
    • Bbigger fruits
    • Cfewer pests
    • Dfaster drying

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13. Question 173· Husbandry of field crops· JAMB

    Yam vines are staked in order to

    • Areduce yield
    • Bexpose the leaves to sunlight for better yield
    • Cprotect against floods
    • Dattract pests

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14. Question 174· Husbandry of field crops· JAMB

    Supplying, as a crop husbandry practice, means

    • Aharvesting the crop
    • Bapplying fertiliser
    • Creplacing seeds or seedlings that failed to grow
    • Dremoving weeds

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15. Question 175· Husbandry of field crops· JAMB

    Yam is staked to

    • Aimprove drainage
    • Bkeep away goats
    • Cstore the tubers
    • Dexpose leaves to sunlight

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16. Question 176· Husbandry of field crops· JAMB

    The seed rate for a crop depends mainly on

    • Asoil colour
    • Bseed size, spacing and viability
    • Crainfall alone
    • Dthe farmer's age

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17. Question 177· Husbandry of field crops· JAMB

    Thinning of seedlings is done to

    • Aadd fertiliser
    • Bincrease pests
    • Creduce competition among plants
    • Dharvest early

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18. Question 178· Husbandry of field crops· JAMB

    Hardening-off of seedlings means

    • Aadding fertiliser
    • Bwatering them heavily
    • Cgradually exposing them to field conditions before transplanting
    • Dremoving weeds

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19. Question 179· Husbandry of field crops· JAMB

    Crop rotation helps to

    • Areduce yield
    • Bincrease weed growth
    • Cexhaust the soil
    • Dcontrol pests and diseases and maintain soil fertility

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20. Question 180· Husbandry of field crops· JAMB

    Lowland rice is usually grown in

    • Awaterlogged or irrigated fields
    • Bsandy desert
    • Crocky hilltops
    • Dsalt marshes

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