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Difficulty: MediumSoils, Natural Vegetation, and Agriculture in India

Which of the following statements regarding the pedological characteristics and climatic conditions of Red Soils and Laterite Soils in India are correct?

  1. Red soils develop a reddish color due to a wide diffusion of iron in crystalline and metamorphic rocks.Answer
  2. B
    Laterite soils are naturally rich in organic matter, nitrogen, and phosphate due to dense forest cover.
  3. Laterite soils develop in regions characterized by high temperatures and monsoon rainfall with alternating wet and dry periods.Answer
  4. D
    Red soils are formed exclusively in waterlogged lowlands receiving annual rainfall exceeding 300 cm300\text{ cm}.

Answer

The correct statements are that red soils derive their reddish color from iron diffusion in crystalline/metamorphic rocks, and that laterite soils develop under high temperatures with alternating wet and dry monsoon seasons.
The statements confirming that red soils derive their color from iron diffusion in crystalline rocks and that laterite soil formation requires tropical climates with alternating wet and dry monsoon seasons are both pedologically accurate.

Step-by-Step Solution

1
Evaluate the cause of red color in Red Soils
Iron diffusion in crystalline and metamorphic rocks gives red soil its characteristic color (turning yellow when hydrated).
This is a fundamental chemical property of red soils in India.
2
Examine the organic and mineral composition of Laterite Soils
Laterite soils are poor in nitrogen, humus, phosphate, and lime, but rich in iron oxide and potash.
High temperatures accelerate bacterial activity that breaks down humus, while intense leaching removes soluble silica and bases.
3
Identify the climatic requirements for Laterite soil pedogenesis
Tropical monsoon conditions with alternating wet and dry periods are essential for intense leaching.
Heavy rainfall leaches silica, leaving behind hydrated oxides of aluminum and iron.
4
Determine the climatic and topographical distribution of Red Soils
Red soils occupy areas of low annual rainfall in the eastern and southern plateau region, not waterlogged high-rainfall zones.
Heavy rainfall regions induce tropical leaching (lateritization), not red soil retention.

Key Concept

Pedological features, chemical composition, and climatic requirements of Red and Laterite soils in India
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Topics

Soils, Natural Vegetation, and Agriculture in India

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