NCERT-aligned Class 10 Geography topic. Every item is anchored to a real location on India's map — built for boards (CBSE, ICSE, state) and UPSC aspirants.
How widespread is alluvial soil in India?
Most widely spread and important soil; the entire Northern Plains are made of alluvial soil. Also extends along Rajasthan-Gujarat corridor and into eastern coastal deltas (Mahanadi, Godavari, Krishna, Kaveri).
Which Himalayan river systems deposited alluvial soil?
Three major systems — Indus, Ganga and Brahmaputra.
What are the three textural components of alluvial soil?
Sand, silt and clay in various proportions; coarser near the foothills (piedmont plains like Duars, Chos and Terai), finer downstream.
Difference between Bangar and Khadar?
Bangar = OLD alluvium, higher in kanker (calcareous nodules), found on uplifted plain. Khadar = NEW alluvium, finer particles, more fertile, found in flood plains and replenished annually.
What nutrients make alluvial soil fertile?
Adequate proportion of potash, phosphoric acid and lime — ideal for sugarcane, paddy, wheat and other cereal/pulse crops.
Why are alluvial regions densely populated?
High fertility supports intensive cultivation (multiple crops per year), which sustains dense rural and urban settlement.
What happens to alluvial soils in drier areas?
They become more alkaline; can be made productive after proper treatment and irrigation.
Other names for black soil?
Regur soil; "black cotton soil" (since it is ideal for cotton cultivation).
Which parent rock formed black soil?
Lava flows of the Deccan Trap (basalt) — climatic + parent-rock factors together produced regur.
Geographical extent of black soil in India?
Plateaus of Maharashtra, Saurashtra, Malwa, Madhya Pradesh and Chhattisgarh; extends south-east along the Godavari and Krishna valleys.
Why is black soil good for moisture retention?
Made of extremely fine clayey material; well known for high moisture-holding capacity — critical in dry-farming regions.
Nutrient profile of black soil?
Rich in calcium carbonate, magnesium, potash and lime; generally POOR in phosphoric content.
This topic is part of the NCERT Class 10 Geography syllabus, drawn from the chapter Ch 1: Resources & Development (Soils). Content is cross-referenced against the latest NCERT textbook editions + standard reference works.
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