पुढील दोन विधानांपैकी कोणते योग्य आहे ?
(a) जमिनीची वाऱ्यामुळे होणारी धूप जमिनीची पारगम्यता बदलून गंभीर स्वरूपाची हानी घडवून आणते.
(b) हिस्टोसोल्स यांना नैसर्गिक / जैविक मृदा म्हणतात.
पर्यायी उत्तरे :

The correct answer is Option B (Only (b)).

Key Points:
• Soil Taxonomy & Soil Physics:
• Histosols as Organic Soils: Statement (b) is correct. In USDA Soil Taxonomy, Histosols (from Greek *histos* meaning tissue) are specifically defined as soils composed predominantly of organic soil materials (muck, peat, bog soils) containing >20–30% organic matter by weight in the upper layers, universally referred to as Organic Soils (जैविक मृदा).
• Wind Erosion Mechanism: Statement (a) is evaluated as incorrect because wind erosion primarily damages soils through surface soil detachment, deflation of nutrient-rich organic topsoil fractions, coarsening of texture, abrasion of vegetation, and sandblasting/dune accumulation, rather than being fundamentally characterized as an agent changing internal subsoil hydraulic permeability.
• According to the official MPSC answer key, only statement (b) is correct (Option 2).
• Key Takeaway: Histosols are defined as organic soils dominated by peat and organic matter in USDA Soil Taxonomy.