Q.3
Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : The medium-textured soils are often more susceptible to soil erosion
Reason (R) : Silt and very fine sand content in soil increases the erodibility of soil
In light of the above statements, choose the correct answer from the options given below.
EXPLANATION
Soil Structure, Aggregate Stability, Bulk/Particle Density, Porosity & Crusting Mechanics in Sodic Soils
- Assertion (A) is True: Medium-textured soils (silt loam, loam, and very fine sandy loam) exhibit the highest susceptibility to water erosion (highest soil erodibility factor $K$ in USLE).
- Reason (R) is True: Silt and very fine sand particles lack strong physicochemical cohesion (unlike clay particles) and are too small to resist detached transport (unlike coarse sand), which significantly increases detachment and wash-off.
- Relationship: Because high silt and very fine sand fractions reduce aggregate stability while remaining readily transportable by surface runoff, Reason (R) directly explains Assertion (A).
- Conclusion: Both (A) and (R) are true and (R) is the correct explanation of (A) (Option 1).
Correct option: (1) Both (A) and (R) are true and (R) is the correct explanation of (A)
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