JAMB and WAEC Agricultural Science questions: Irrigation and drainage

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

1. Question 1· Irrigation and drainage· JAMB

   Infiltration is the

   • Aentry of water into the soil surface
   • Bloss of water from leaves
   • Cflow of water over the surface
   • Dstorage of water in dams

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2. Question 2· Irrigation and drainage· JAMB

   Overhead irrigation can encourage

   • Asalt build-up only
   • Bleaf diseases because the foliage stays wet
   • Cdrought
   • Dsoil acidity

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3. Question 3· 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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4. Question 4· 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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5. Question 5· 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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6. Question 6· Irrigation and drainage· JAMB

   Basin irrigation is suitable for crops such as

   • Arice
   • Bcassava on ridges
   • Cyam on mounds
   • Dgroundnut on heaps

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7. Question 7· 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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8. Question 8· Irrigation and drainage· JAMB

   Sprinkler irrigation sprays water

   • Alike rain over the crop
   • Bonly on the roots
   • Cin channels
   • Dby flooding

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9. Question 9· Irrigation and drainage· JAMB

   The method of irrigation in which water drips slowly at the base of each plant through small pipes is

   • Aflood irrigation
   • Bfurrow irrigation
   • Cdrip irrigation
   • Dsprinkler irrigation

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10. Question 10· Irrigation and drainage· JAMB

    Drip irrigation is suitable where

    • Awater is plentiful everywhere
    • Bwater is scarce
    • Csoil is waterlogged
    • Dthere is no crop

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11. Question 11· 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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12. Question 12· Irrigation and drainage· WAEC

    Waterlogging affects crops mainly by

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

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13. Question 13· Irrigation and drainage· JAMB

    Tile drainage removes excess water through

    • Aplants
    • Bopen channels
    • Cpumps only
    • Dunderground pipes

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14. Question 14· 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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15. Question 15· Irrigation and drainage· JAMB

    Furrow irrigation is the method in which water

    • Adrips at the base of each plant
    • Bis sprayed into the air
    • Cflows along channels between crop rows
    • Dis poured by hand from cans

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16. Question 16· Irrigation and drainage· WAEC

    Water for irrigation can be obtained from

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

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17. Question 17· Irrigation and drainage· JAMB

    A disadvantage of sprinkler irrigation is that it

    • Acannot be used on slopes
    • Bneeds no pumping
    • Calways causes erosion
    • Dloses much water through evaporation and is costly

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18. Question 18· Irrigation and drainage· WAEC

    A problem of poor drainage is

    • Awaterlogging
    • Bdrought
    • Cgood aeration
    • Dfast root growth

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19. Question 19· Irrigation and drainage· JAMB

    Surface drainage removes

    • Aall soil
    • Bnutrients
    • Cpests
    • Dexcess water from the soil surface

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20. Question 20· 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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