JAMB and WAEC Agricultural Science questions: Irrigation and drainage

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

1. Question 21· 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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   Explanation and discussion

2. Question 22· 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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   Explanation and discussion

3. Question 23· 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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   Explanation and discussion

4. Question 24· 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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   Explanation and discussion

5. Question 25· 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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6. Question 26· 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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7. Question 27· 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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   Explanation and discussion

8. Question 28· Irrigation and drainage· JAMB

   Water lost from the soil surface and from plants together is

   • Ainfiltration
   • Bevapotranspiration
   • Cpercolation
   • Drunoff

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9. Question 29· Irrigation and drainage· WAEC

   Which irrigation method wastes the least water?

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

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10. Question 30· Irrigation and drainage· WAEC

    Overhead sprinkler irrigation is suitable for

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

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    Explanation and discussion

11. Question 31· 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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    Explanation and discussion

12. Question 32· 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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    Explanation and discussion

13. Question 33· Irrigation and drainage· JAMB

    Draining a waterlogged soil mainly improves

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

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14. Question 34· 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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15. Question 35· 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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16. Question 36· 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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    Explanation and discussion