Question:
Which soil order stands for recent alluvial soil?
Which soil order stands for recent alluvial soil?
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Remember: "Entisols" are "rent (recent)" soils. They are characterized by little or no profile development and are typical of active river floodplains where fresh alluvial sediments are constantly deposited.
Updated On: Aug 7, 2026
- Alfisol
- Entisol
- Inceptisol
- Mollisol
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Under the USDA Soil Taxonomy, soils are classified into twelve orders based on their diagnostic horizons, weathering intensity, and degree of soil profile development.
Step 2: Detailed Explanation:
Let us analyze the developmental stages represented by the relevant soil orders:
Entisols (B): These are soils showing little or no profile development (no diagnostic B horizon).
They are the youngest soils in geological terms.
Recent alluvial deposits, such as those found on active river floodplains, diara lands, and sand dunes, undergo constant deposition and erosion, preventing mature soil horizons from forming.
Therefore, young, recent alluvial soils are classified primarily under the order Entisols.
Inceptisols (C): These are slightly more developed soils showing embryonic horizon development (such as a weak B horizon). Older alluvial soils are often classified here.
Alfisols (A): These are mature, moderately weathered soils with an argillic (clay-rich) B horizon, typical of semi-arid to humid forest areas.
Mollisols (D): These are deep, organic-rich grassland soils characterized by a thick, dark mollic epipedon.
Step 3: Final Answer:
Recent alluvial soils are represented by the order Entisol, which corresponds to option (B).
Under the USDA Soil Taxonomy, soils are classified into twelve orders based on their diagnostic horizons, weathering intensity, and degree of soil profile development.
Step 2: Detailed Explanation:
Let us analyze the developmental stages represented by the relevant soil orders:
Entisols (B): These are soils showing little or no profile development (no diagnostic B horizon).
They are the youngest soils in geological terms.
Recent alluvial deposits, such as those found on active river floodplains, diara lands, and sand dunes, undergo constant deposition and erosion, preventing mature soil horizons from forming.
Therefore, young, recent alluvial soils are classified primarily under the order Entisols.
Inceptisols (C): These are slightly more developed soils showing embryonic horizon development (such as a weak B horizon). Older alluvial soils are often classified here.
Alfisols (A): These are mature, moderately weathered soils with an argillic (clay-rich) B horizon, typical of semi-arid to humid forest areas.
Mollisols (D): These are deep, organic-rich grassland soils characterized by a thick, dark mollic epipedon.
Step 3: Final Answer:
Recent alluvial soils are represented by the order Entisol, which corresponds to option (B).
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