Question

) Non-humic organic matter consists of _______:

a) living organisms and cells

b) dead tissues and wastes

c) identifiable organic compounds

d) polymerized, non-identifiable molecules

e) all of the above

Answer 1

C..Non-humic substances consist of identifiable biomolecules.

Non-humic organic molecules are released directly from cells of fresh residues, such as proteins, amino acids, sugars, and starches. This part of soil organic matter is the active, or easily decomposed, fraction. This active fraction is influenced strongly by weather conditions, moisture status of the soil, growth stage of the vegetation, addition of organic residues, and cultural practices, such as tillage. It is the main food supply for various organisms in the soil.