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WAEC Agricultural Science 2011 Question 9

Question 9

Rocks and Soil Formation

In which layer of the soil profile do most biological activities occur?

  1. A.D-horizon
  2. B.C-horizon
  3. C.B-horizon
  4. D.A-horizon
Show the answer and explanation

Answer: D (A-horizon)

Explanation

The topsoil (A-horizon) has the most organic matter, air and roots, so most organisms live there.