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JAMB Biology 1985 Question 47

Question 47

Soil

Water retention is highest in soils which are rich in

  1. A.sand, poor in humus and devoid of clay
  2. B.clay and sand, but poor in humus
  3. C.clay and humus, but poor in sand
  4. D.clay, poor in humus and devoid of sand
  5. E.sand and humus, but poor in clay.
Show the answer and explanation

Answer: C (clay and humus, but poor in sand)

Explanation

Clay particles have tiny spaces that hold water, and humus soaks up water like a sponge. Sand drains quickly, so a soil rich in clay and humus but poor in sand holds the most water.