A) living organic and inorganic matter
B) radioactive materials
C) dead and decayed organic matter
D) only living organic matter
Correct Answer: C
Solution :
Humus is the dark-coloured amorphous colloidal material that constitutes the organic component of soil. It is formed by the decomposition of plant and animal remains and excrement and has a complex and variable chemical composition. Being a colloid, it can hold water and improve water retaining properties of soil, it also enhances soil fertility and work ability. Acidic humus (mor) is found in regions of coniferous forest, where the decay is brought about mainly by fungi. Alkaline humus (mull) is typically found in grassland and deciduous forest.
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