Which statement correctly describes single grain structure?

• A. It is described as structureless and occurs only in sand.
• B. It occurs in all soils.
• C. It is the same as granular structure.
• D. It is present in C horizons.

Answer: (A)

Single grain structure means the soil has no structural units; individual mineral grains stay separate and there’s no ped formation, so you can easily tease apart the grains and there’s no binding into aggregates. This is typical in sands, where little cementing material or clay keeps grains from sticking together, making the soil appear structureless. That’s why describing it as structureless and occurring only in sand is the correct way to characterize single grain structure. It isn’t true that all soils show this pattern, since many soils develop some type of structure (granular, blocky, etc.) due to clay, moisture, and cementing agents. It isn’t the same as granular structure, which involves grains bound into small peds, and it isn’t a standard feature of C horizons, which often exhibit different kinds of structure or massive conditions.