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Biology JAMB Past Questions

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306
Erosion can be reduced along shape by
  • A. ridging across slope
  • B. ridging up slope
  • C. ridging down slope
  • D. crop rotation
  • E. bush fallowing system
View Answer & Discuss (5) JAMB 1984
307
If a handful of soil is shaken with water and left to settle, the soil particles will settle from light to heavy particles as follows
  • A. humus, clay, silt, sand, stones
  • B. humus, silt, clay, sand, stones
  • C. humus, clay,silt, stones, sand
  • D. humus, sand, silt, clay, stones
  • E. clay, humus, silt, sand, stones
View Answer & Discuss (12) JAMB 1984
308
Denitrifying bacteria in nature liberate gaseous nitrogen directly from
  • A. ammonium salts
  • B. soil nitrates
  • C. thunderstorms
  • D. soil nitrites
  • E. plant and animal proteins
View Answer & Discuss (8) JAMB 1984
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309

Leaching is

  • A. Washing away of humus from the soil surface
  • B. reducing of soil aeration by pressure
  • C. soil erosion by means other than rainfall
  • D. loss of organic matter due to exposure to direct sunlight
  • E. washing out chalk and limestone from upper layers of by heavy rains
View Answer & Discuss (16) JAMB 1984
310

The process of soil erosion is usually from

  • A. rill → sheet → gully
  • B. gully → rill → sheet
  • C. sheet → guly → rill
  • D. sheet → rill → gully
  • E. rill → gully → sheet
View Answer & Discuss (10) JAMB 1984
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