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Difficulty: Very hardSoils, Natural Vegetation, and Agriculture in India

Regarding the pedological properties, natural vegetation dynamics, and ecological distributions across India, which of the following statements are correct?

  1. Peaty soils in coastal Kerala (locally termed Kari soils) are characterized by heavy organic matter accumulation, high acidity, and formation under submerged anaerobic conditions.Answer
  2. B
    Tropical Wet Evergreen forests of the Western Ghats are characterized by a single dominant canopy species with open undergrowth due to severe soil leaching.
  3. Shola forests occurring above 1,500 meters altitude in the Nilgiris and Anaimalai hills represent stunted temperate evergreen forest patches set within rolling grasslands.Answer
  4. D
    Black soils of the Deccan Trap derive their moisture-retentive self-ploughing capacity from a high concentration of coarse quartz grains that undergo rapid illuviation under heavy annual rainfall (>250 cm).

Answer

The correct statements are the ones describing the anaerobic, highly acidic peaty Kari soils of coastal Kerala and the high-altitude montane temperate Shola forest patches of the Nilgiri and Anaimalai ranges.
The statement regarding peaty soils accurately captures the formation of Kari soils in coastal Kerala under submerged anaerobic conditions resulting in rich humus and high acidity. Additionally, the statement about Shola forests correctly describes the unique montane temperate evergreen patches nestled within high-altitude grasslands of the Nilgiris and Anaimalai hills.

Step-by-Step Solution

1
Evaluate the statement on peaty soils (Kari soils) of coastal Kerala.
Peaty soils form in waterlogged, humid coastal regions with rich vegetation growth, creating heavy organic matter deposition (up to 40-50%) and high soil acidity due to iron sulfide oxidization under anaerobic conditions.
Validates the geochemical and hydrological conditions governing Kerala peaty soil formation.
2
Evaluate the statement regarding Tropical Wet Evergreen forest canopy and species composition.
Evergreen forests of the Western Ghats feature intense biodiversity with layered stratifications rather than mono-species dominance.
Exposes the misconception that wet evergreen biomes exhibit single-species stands.
3
Evaluate the statement on Shola vegetation in Southern India.
In the Nilgiri, Palani, and Anaimalai ranges above 1,500 meters, montane vegetation manifests as stunted temperate evergreen forests (Sholas) in valleys, surrounded by subtropical grassland ecosystems.
Confirms the elevational and topographic distribution of Shola vegetation.
4
Evaluate the statement on Black soil composition and moisture retention mechanisms.
Black soil (Regur) moisture retention and deep cracking (self-ploughing) stem from fine-grained montmorillonite clay swell-shrink dynamics in semi-arid basaltic trap regions, not coarse quartz illuviation under heavy rainfall.
Corrects the mineralogical and climatic misattribution of regur soil physics.

Key Concept

Pedological and Ecological Characteristics of Indian Soils and Natural Vegetation
Estimated Time:2m 0s
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Topics

Soils, Natural Vegetation, and Agriculture in India

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