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Soil Vegetation MCQs
High-yield multiple choice questions asked in previous years (UPSC, SSC CGL, JKSSB, RRB & State PSCs).
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📌 High-yield pedology & biogeography questions in UPSC, SSC, CDS, NDA, and State PSCs.
Major Soil Orders of India (ICAR Classification)
- • Alluvial Soils (40% of landmass): Deposited by river systems in Indo-Gangetic and Brahmaputra plains and coastal deltas. Divided into Khadar (newer, highly fertile flood-plain alluvium) and Bhangar (older, less fertile upland alluvium containing calcareous nodules called Kankar). Rich in potash and lime; deficient in nitrogen and phosphorus.
- • Black Soils (Regur / Black Cotton Soil): Formed by weathering of basaltic lava rocks of the Deccan Trap (Maharashtra, Gujarat, MP). Rich in clay, iron, lime, calcium, magnesium; highly argillaceous with high water-retaining capacity; develops deep self-ploughing fissures in dry summers.
- • Red & Yellow Soils: Formed on crystalline igneous rocks (granite/gneiss) under low rainfall; reddish color due to wide diffusion of ferric iron oxides; acidic, poor in nitrogen and humus.
- • Laterite Soils: Formed under high temperature and heavy alternating wet-dry seasons in Western Ghats, Meghalaya. Intense leaching (silica leached away, leaving iron and aluminum oxides); acidic, poor in organic matter; ideal for tea, coffee, rubber, and cashew nuts.
- • Saline / Alkaline Soils (Usar / Reh / Kallar): Contain excess sodium, potassium, and magnesium salts due to poor drainage and intensive canal irrigation in dry areas (Punjab, Haryana).
Natural Vegetation Types & Forest Cover
- • Tropical Evergreen & Semi-Evergreen: Rainfall >200 cm (Western Ghats, North-East hills, Andaman & Nicobar). Multi-layered canopy, no definite shedding season. Timber: Rosewood, Mahogany, Ebony, Aini, Rubber.
- • Tropical Deciduous (Monsoon Forests - 65% of India): Divided into Moist Deciduous (100-200 cm rain - Teak, Sal, Shisham, Sandalwood) and Dry Deciduous (70-100 cm rain - Tendu, Palas, Amaltas, Bel). Shed leaves for 6-8 weeks in spring/summer.
- • Tropical Thorn Forests: Rainfall <50 cm (Rajasthan, Gujarat, SW Punjab). Acacias, Cacti, Babool, Khejri.
- • Mangrove (Tidal) Forests: Littoral salt-tolerant halophytes growing in muddy intertidal zones. Sundarbans (Sundari tree, Heritiera fomes) - world's largest mangrove forest; feature stilt roots and breathing roots (pneumatophores).
| Soil / Forest Type | Coverage / Distribution | Key Chemical / Biological Traits | Commercial Crops / Trees |
|---|---|---|---|
| Alluvial Soil | Largest order (~40%) | Khadar (new) vs Bhangar (old); Rich in potash | Wheat, Paddy, Sugarcane, Jute |
| Black Soil (Regur) | Deccan Trap (MH, GJ) | High clay, self-ploughing cracks, moisture retention | Cotton, Soybean, Tobacco |
| Laterite Soil | Western Ghats, Meghalaya | Intensely leached; rich in iron & bauxite | Cashew, Tea, Coffee, Rubber |
| Tropical Moist Deciduous | Most widespread forest | Sheds leaves in dry spring (6-8 weeks) | Teak (Tectona grandis), Sal, Sandalwood |
| Mangroves (Sundarbans) | Ganga-Brahmaputra Delta | Halophytic, Pneumatophores (breathing roots) | Sundari tree, Royal Bengal Tiger |
Showing 15 Practice Questions
Q1SSC CGL 2023Easy
Black soil, extensively found in the Deccan Trap region and renowned for cotton cultivation, is locally termed as:
Q2UPSC CSE PrelimsEasy
Which soil order covers the largest geographic surface area (over 40%) in India?
Q3JKSSB FAA 2022Medium
Laterite soil, formed as a result of intense tropical weathering and leaching, is rich in which chemical elements?
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Q4CDS 2022Easy
Which of the following forest types is the most widespread and commercially valuable in India, covering over 60% of the forested area?
Q5JKSSB VLW 2023Easy
The older alluvium deposited on elevated terraces above river floodplains, containing calcareous nodules (Kankar), is called:
Q6SSC CGL Tier-1Easy
Sundari trees (Heritiera fomes), which give the world-famous Sundarbans delta its name, are classified as:
Q7JKPSC KAS PrelimsEasy
The reddish appearance of Red Soils across the peninsular plateau of Tamil Nadu and Odisha is primarily caused by:
Q8NDA 2022Easy
Which commercial tree species, providing valuable aromatic timber and essential oil, is native to the dry deciduous forests of Karnataka and Tamil Nadu?
Q9SSC CHSLEasy
Laterite soil is exceptionally well-suited for cultivating which plantation crop in Tamil Nadu, Kerala, and Andhra Pradesh?
Q10UPSC CSE PrelimsMedium
Saline and alkaline soils, locally designated as 'Usar', 'Reh', or 'Kallar', have developed in canal-irrigated parts of Punjab and Haryana due to:
Q11JKSSB Sub-InspectorEasy
Teak (Tectona grandis) and Sal (Shorea robusta) are the two signature commercial tree species of which forest biome in India?
Q12JKSSB Patwari 2024Medium
The porous, pebble-strewn narrow belt parallel to the Shiwalik foothills where Himalayan streams disappear underground is called:
Q13Current Affairs & Geography 2022-2023Easy
Which state has the largest total forest cover by area in India according to the biennial India State of Forest Report (ISFR)?
Q14CDS 2021Easy
In which forest zone do trees possess thick succulent stems, small waxy leaves, and deep root systems to withstand severe aridity?
Q15UPSC CSE / State PSCHard
Peaty and Marshy soils (Kari), rich in dark organic matter (humus up to 40-50%) and strongly acidic, are found in:
Frequently Asked Questions (Soil Vegetation)
Q: What is the difference between 'Khadar' and 'Bhangar' alluvial soils?
Bhangar is the older alluvium found on higher river terraces beyond normal flood levels; it is clayey, darker, and contains calcareous nodules (Kankar). Khadar is the newer, light-colored fine sandy silt deposited annually along low-lying river floodplains, making it exceptionally fertile without chemical fertilizers.
Q: Why is Black Soil famously termed 'self-ploughing'?
Black soil has a high proportion of expanding clay minerals (montmorillonite). When wet, it swells and becomes intensely sticky; upon drying during summer, it contracts severely, forming deep, wide cracks. Soil particles crumble into these cracks, effectively aerating and naturally turning over the soil, a phenomenon called 'self-ploughing'.
Q: What are 'Pneumatophores' in mangrove vegetation?
Pneumatophores are specialized erect, pencil-like roots that grow vertically upward out of waterlogged, anaerobic saline mud in mangrove forests to take in atmospheric oxygen for the root system.
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