Oxisols: The most extremely weathered and pedogenically advanced soil order in USDA Soil Taxonomy.
Characteristics: Dominated by an oxic subsurface diagnostic horizon composed almost entirely of low-activity 1:1 clays (kaolinite) and residual sesquioxides of iron and aluminum (goethite, gibbsite, hematite), with virtually all primary weatherable minerals depleted.
Comparison: Inceptisols are weakly developed young soils; Vertisols are expanding 2:1 clay soils; Alfisols show moderate weathering with argillic horizons. (Correct answer: Option 3)
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Official PYQ Papers
Previous Year Papers ofWater Science and Technology
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