Leaching is

Biology

JAMB 1984

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

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Correct Answer: Option E

Explanation

Leaching usually refers to the movement of dissolved substances with water percolating through soil. Sometimes, leaching may also refer to the movement of soluble chemicals out of biological tissues, as when rainfall causes potassium and other ions to be lost by foliage.

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