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Soils of India: Types, Distribution and Key Features — MCQs with Answers

Test what you know about Soils of India: Types, Distribution and Key Features with 10 UPSC Prelims-style questions. Try each one first, then tap “Show answer” for the correct option and its explanation.

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  1. Q1. Which set contains the soil-forming factors identified in the article?

    1. Only soil colour and state boundaries
    2. Only crop prices and market access
    3. Parent material, climate, organisms, relief and time
    4. Only rainfall during the latest season
    Show answer

    Correct answer: (C) Parent material, climate, organisms, relief and time

    Explanation

    Correct Answer: (C). Soil forms through interaction between parent material, climate, organisms, relief and time. Colour is a property, while state boundaries are administrative lines. Crop prices concern economic decisions rather than the listed formation factors. A single season of rainfall cannot represent the long-term combination of processes responsible for soil development.

  2. Q2. Consider these statements: 1. Broad Indian soil groups form one complete formal scientific taxonomy. 2. A broad soil group may contain multiple formally classified soils. Which statement is correct?

    1. 2 only
    2. 1 only
    3. Both 1 and 2
    4. Neither 1 nor 2
    Show answer

    Correct answer: (A) 2 only

    Explanation

    Correct Answer: (A). Statement 2 is correct: geographic groups can include different formally classified soils. Statement 1 is incorrect because familiar labels such as alluvial or black are practical broad categories, not one complete scientific taxonomy. Formal systems identify orders and subgroups. The alternatives either accept the false equivalence or reject real within-group variation.

  3. Q3. Which pairing correctly distinguishes khadar from bhangar in the northern plains?

    1. Khadar: basaltic clay; bhangar: windblown desert sand
    2. Khadar: older higher terraces; bhangar: newer active floodplains
    3. Khadar: mountain peat; bhangar: coastal salt deposits
    4. Khadar: newer floodplain deposits; bhangar: older deposits on higher terraces
    Show answer

    Correct answer: (D) Khadar: newer floodplain deposits; bhangar: older deposits on higher terraces

    Explanation

    Correct Answer: (D). Khadar refers to newer deposits near active floodplains, whereas bhangar refers to older alluvium on higher terraces. Reversing these associations is incorrect. Basaltic clay, desert sand, mountain peat and coastal salts do not define this traditional distinction. The distinction concerns relative age and landscape position, not guaranteed fertility.

  4. Q4. Assertion: Black soils can develop wide cracks in dry weather. Reason: Their clay-rich material shrinks on drying and swells when wet. Choose the correct relationship.

    1. Both are true, but the reason does not explain the assertion
    2. Both are true, and the reason explains the assertion
    3. The assertion is true, but the reason is false
    4. The assertion is false, but the reason is true
    Show answer

    Correct answer: (B) Both are true, and the reason explains the assertion

    Explanation

    Correct Answer: (B). Both propositions are true, and shrinkage on drying explains the cracks. The article associates this shrink-swell behaviour with clay-rich black soils of the basaltic Deccan. Treating either proposition as false or denying their connection overlooks the mechanism. High clay content can also make drainage slow and field operations difficult.

  5. Q5. What chiefly explains the red and yellow colours of these soil groups?

    1. Iron compounds
    2. A guarantee of uniformly high fertility
    3. Exclusive formation from recent river deposits
    4. Permanent waterlogging in every location
    Show answer

    Correct answer: (A) Iron compounds

    Explanation

    Correct Answer: (A). Iron compounds contribute to the red and yellow colours described in the article. Colour does not guarantee uniform fertility because texture, acidity, moisture and nutrient supply vary. Recent river deposition defines alluvial formation, not these colour groups. Permanent waterlogging is also not their defining characteristic across the peninsular uplands.

  6. Q6. Which soil-process association is correct?

    1. Alluvial — Formation solely through evaporation in deserts
    2. Arid — Persistent high rainfall and waterlogging
    3. Laterite — Strong weathering and leaching in warm humid conditions
    4. Black — No shrink-swell behaviour despite high clay content
    Show answer

    Correct answer: (C) Laterite — Strong weathering and leaching in warm humid conditions

    Explanation

    Correct Answer: (C). Lateritic soils develop through strong weathering and leaching in warm humid settings, often with alternating wet and dry periods. Alluvium instead involves river deposition. Arid soils reflect low rainfall and high evaporation. Black soils exhibit shrink-swell behaviour. Each incorrect pair assigns a process contrary to the soil group described.

  7. Q7. In a susceptible arid field, which practice may create secondary salinity?

    1. Site-specific drainage after diagnosis
    2. Irrigation without adequate drainage
    3. Shelterbelts to reduce wind erosion
    4. Soil testing to guide nutrient application
    Show answer

    Correct answer: (B) Irrigation without adequate drainage

    Explanation

    Correct Answer: (B). Irrigation without sufficient drainage can cause salt accumulation in susceptible arid soils. Properly planned drainage addresses this risk rather than creating it. Shelterbelts control wind erosion, while soil tests guide nutrient management. Aridity and irrigation-induced salinity are related concerns but should not be treated as identical formation processes.

  8. Q8. Consider these pairs: 1. Sloping land — Contour cultivation and terracing 2. Dry windy regions — Shelterbelts and controlled grazing Which are correctly matched?

    1. 1 only
    2. 2 only
    3. Neither 1 nor 2
    4. Both 1 and 2
    Show answer

    Correct answer: (D) Both 1 and 2

    Explanation

    Correct Answer: (D). Both pairs correctly match conservation methods to terrain. Contour cultivation and terraces slow runoff on slopes. Shelterbelts and controlled grazing reduce exposure to wind erosion in dry regions. Choosing only one omits another valid response, while rejecting both ignores the article emphasis on matching conservation to local degradation processes.

  9. Q9. Which statement correctly describes the distribution of alluvial soils?

    1. They occur in northern plains as well as river valleys, coastal plains and deltas
    2. They occur exclusively inside the Ganga basin
    3. They are confined to basaltic Deccan uplands
    4. They occur only on the highest Himalayan slopes
    Show answer

    Correct answer: (A) They occur in northern plains as well as river valleys, coastal plains and deltas

    Explanation

    Correct Answer: (A). Alluvium occurs in the Indo-Gangetic and Brahmaputra plains and also in valleys, coastal plains and deltas. Limiting it to the Ganga basin excludes other river-deposited landscapes. Basaltic Deccan uplands are associated with black soils, while the highest mountain slopes do not define the general distribution of alluvial deposits.

  10. Q10. Which approach is appropriate for salt-affected land?

    1. Apply one identical amendment to every salt-affected field
    2. Ignore drainage and rely only on soil colour
    3. Distinguish salinity from sodicity and use drainage and amendments suited to the site
    4. Treat every saline soil as identical to every arid soil
    Show answer

    Correct answer: (C) Distinguish salinity from sodicity and use drainage and amendments suited to the site

    Explanation

    Correct Answer: (C). The article recommends diagnosing salinity versus sodicity before selecting drainage and amendments. Different causes and local conditions require different remedies. One universal amendment ignores that variation. Colour cannot replace diagnosis or drainage assessment, and arid soils are not automatically identical to all salt-affected soils in irrigated or coastal settings.

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