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JAMB Biology 1984 Question 49

Question 49

Soil

Leaching is

  1. A.washing away of humus from the soil surface
  2. B.reduction of soil aeration by pressure
  3. C.soil erosion by means other than rainfall
  4. D.loss of organic matter due to exposure to direct sunlight
  5. E.washing out of chalk and limestone from upper layers of soil by heavy rains.
Show the answer and explanation

Answer: E (washing out of chalk and limestone from upper layers of soil by heavy rains.)

Explanation

Leaching happens when rain water sinks through the soil and dissolves soluble minerals (e.g. chalk and lime), carrying them down out of the topsoil where roots can reach them.