WAEC Agricultural Science questions: Irrigation and drainage

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

1. Question 1· Irrigation and drainage· WAEC

   Excessive irrigation in dry areas can cause

   • Amore humus
   • Bsalinity of the soil
   • Cless evaporation
   • Dbetter soil structure

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2. Question 2· Irrigation and drainage· WAEC

   A problem of irrigation in dry areas is

   • Atoo much humus
   • Bsalt build-up in the soil
   • Cexcess nitrogen
   • Dheavy leaching by rain

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3. Question 3· Irrigation and drainage· WAEC

   Drip (trickle) irrigation is efficient because it

   • Adelivers water directly to the roots
   • Bfloods the whole field
   • Cwastes much water
   • Dneeds no pipes

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4. Question 4· Irrigation and drainage· WAEC

   Shadoof irrigation lifts water using

   • Aa tractor
   • Ban electric pump
   • Ca windmill
   • Da pole, bucket and counterweight

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5. Question 5· Irrigation and drainage· WAEC

   A disadvantage of flood irrigation is that it

   • Awastes water and may cause erosion
   • Buses no water
   • Cis very expensive to build always
   • Dneeds computers

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6. Question 6· Irrigation and drainage· WAEC

   Waterlogging affects crops mainly by

   • Aadding nutrients
   • Breducing oxygen around the roots
   • Craising temperature
   • Dincreasing sunlight

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7. Question 7· Irrigation and drainage· WAEC

   Sprinkler irrigation applies water

   • Aby flooding the field
   • Bthrough underground pipes only
   • Cas a spray like rain
   • Din furrows

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8. Question 8· Irrigation and drainage· WAEC

   Water for irrigation can be obtained from

   • Afertilisers
   • Bsand
   • Crocks
   • Drivers, dams and boreholes

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9. Question 9· Irrigation and drainage· WAEC

   A problem of poor drainage is

   • Awaterlogging
   • Bdrought
   • Cgood aeration
   • Dfast root growth

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10. Question 10· Irrigation and drainage· WAEC

    Irrigation allows farmers to

    • Aavoid weeding
    • Bstop all planting
    • Cgrow crops in the dry season
    • Dreduce yields

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11. Question 11· Irrigation and drainage· WAEC

    Mole drains are

    • Aunlined underground channels formed in clay soil by a mole plough
    • Bopen ditches
    • Cdrip pipes
    • Ddams

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12. Question 12· Irrigation and drainage· WAEC

    Drainage is the

    • Asupply of water to crops
    • Bremoval of excess water from the soil
    • Cdigging of wells
    • Dstorage of grain

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13. Question 13· Irrigation and drainage· WAEC

    Irrigation is the

    • Aharvesting of rain
    • Bremoval of excess water
    • Cartificial supply of water to crops
    • Ddrying of crops

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14. Question 14· Irrigation and drainage· WAEC

    Irrigation is

    • Aremoval of excess water
    • Bartificial application of water to crops
    • Cflooding of towns
    • Dcollecting rainwater only

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15. Question 15· Irrigation and drainage· WAEC

    Which irrigation method wastes the least water?

    • Aflood irrigation
    • Bdrip irrigation
    • Cfurrow irrigation
    • Dbasin irrigation

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16. Question 16· Irrigation and drainage· WAEC

    Overhead sprinkler irrigation is suitable for

    • Aswamps
    • Brice paddies only
    • Cvegetables and lawns
    • Dforests

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17. Question 17· Irrigation and drainage· WAEC

    A rain gauge is used on the farm to

    • Ameasure soil pH
    • Bmeasure wind
    • Cmeasure rainfall
    • Dmeasure temperature

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18. Question 18· Irrigation and drainage· WAEC

    Drainage of farmland is necessary to

    • Aremove excess water and improve soil aeration
    • Badd water
    • Cincrease salinity
    • Dreduce root growth

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    Explanation and discussion