Discussion
The property that is not affected by the amount of organic matter in the soil is
Answer: C
The property not affected by organic matter is Soil texture.
Soil texture is the relative proportion of sand, silt and clay, the mineral particles of the soil. It is inherited from the parent material and changes only over very long periods; adding or losing organic matter does not alter it.
The other three depend heavily on organic matter. Humus has a very high cation exchange capacity, organic matter is the food of soil organisms and drives biological activity, and it binds particles into aggregates, improving soil structure.
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