Humus generally refers to the decomposed organic residues which have undergone a series of degradation and synthesis cycles. The humic substances consist of a series of highly acidic, yellow to black coloured, high molecular weight compounds __________________, which can be separated using different extraction procedures:
Correct answer: A. both A & B
- A. both A & B
- B. Humic acid & Fulvic acid
- C. Hymatomelanic acid & Humin
- D. None of theseGeology
Explanation
Humic substances are commonly fractionated into fulvic acid, humic acid and humin; hymatomelanic acid is also recognised as a fraction of humic material. Thus both groups listed in A and B are included.
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