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Question

Organic matter decayed to a relatively stable, amorphous state; formed when soil microorganisms decompose animal and plant material into elements usable by plants.
  1. Peat
  2. Manure
  3. Humus
  4. Green manure

A
Manure
B
Peat
C
Humus
D
Green manure
Solution
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The dead plants and animals are degraded due to the microbial activity of the decomposers. The decomposers include the microbes which are involved in the breaking down of the organic complexes and recycling of the nutrients. The material which is formed is known as humus which is very rich in nutrients. This matter is relatively stable and insoluble in water. The soil which contains more amount of humus is referred as more fertile and productive for the growth of the plants.
Thus, the correct answer is option C.

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