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WAEC Biology 2008 Question 36

Question 36

Population Ecology

Shrubs do not survive on newly weathered soils because

  1. A.the top soil is shallow
  2. B.drainage on such soil is poor
  3. C.humus is absent from the soil
  4. D.the soil tends to be sandy.
Show the answer and explanation

Answer: C (humus is absent from the soil)

Explanation

Newly weathered soil is just broken rock with no humus, so it holds little water and nutrients; pioneer plants must add humus before shrubs can grow.