JAMB Agricultural Science questions: Irrigation and drainage

18 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· JAMB

   Basin irrigation is suitable for crops such as

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

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4. Question 4· 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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5. Question 5· 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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6. Question 6· 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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7. Question 7· Irrigation and drainage· JAMB

   Tile drainage removes excess water through

   • Aplants
   • Bopen channels
   • Cpumps only
   • Dunderground pipes

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8. Question 8· 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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9. Question 9· 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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10. Question 10· Irrigation and drainage· JAMB

    Surface drainage removes

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

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11. Question 11· Irrigation and drainage· JAMB

    A dam in an irrigation scheme is used to

    • Adrain swamps
    • Bstore water
    • Cplough land
    • Dharvest crops

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12. Question 12· Irrigation and drainage· JAMB

    Digging open ditches across a waterlogged field is a way of

    • Adraining the land
    • Birrigating the crop
    • Cfertilising the soil
    • Dcontrolling pests

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13. Question 13· Irrigation and drainage· JAMB

    Furrow irrigation delivers water

    • Athrough drip pipes only
    • Bas fine spray from above
    • Calong channels between crop rows
    • Dby hand watering only

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14. Question 14· Irrigation and drainage· JAMB

    Water lost from the soil surface and from plants together is

    • Ainfiltration
    • Bevapotranspiration
    • Cpercolation
    • Drunoff

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15. Question 15· Irrigation and drainage· JAMB

    Which of these is a source of water for irrigation?

    • ASand dunes
    • BThe harmattan wind
    • CLaterite
    • DA dam

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16. Question 16· Irrigation and drainage· JAMB

    Draining a waterlogged soil mainly improves

    • Asoil acidity
    • Bsoil aeration
    • Csoil salinity
    • Dsoil colour

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17. Question 17· Irrigation and drainage· JAMB

    A danger of poorly managed irrigation in dry areas is

    • Amore rainfall
    • Bincreased soil fertility
    • Csalinisation of the soil
    • Dreduced evaporation

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18. Question 18· Irrigation and drainage· JAMB

    Salinisation of irrigated land is caused by

    • Afertile soils
    • Btoo much rain
    • Caccumulation of salts from evaporating irrigation water
    • Dforest growth

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