Moderate

Humus is present in:

Correct answer: A. Upper soil layer

  • A. Upper soil layer
  • B. Entire solum
  • C. Horizon B
  • D. Entire top-soil

Explanation

Humus is the dark, decomposed organic matter concentrated mainly in the upper soil layer or topsoil. It generally decreases with depth, so it is not uniformly present throughout the solum.

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