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Explain the main… (Class 10 Social Science 2025, Q32a)

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Social ScienceCBSE Class 10 · Board exam 2025, set 32/6/1 · 5 marks · Long answer

CBSE Class 10 Social Science 2025: question 32(a)

Set in the CBSE Class 10 board exam of 2025, paper 32/6/1, section D, question 32(a), for 5 marks. Try it first; the hints and our step-by-step solution are below.

Q32(a) · 5 marks · Long answerResources and Development

Explain the main features of alluvial soil.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 32/6/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Which rivers bring this soil, and what does it contain?

Hint 2

Recall the two types by age and which is more fertile.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Alluvial soil is deposited by the three Himalayan river systems, the Indus, Ganga and Brahmaputra. It consists of varying proportions of sand, silt and clay.

    1 mark

  2. Moving inland towards the river valleys, soil particles become somewhat bigger. Near the break of slope in piedmont plains such as Duars, Chos and Terai, the soils are coarse.

    1 mark

  3. By age, alluvial soil is classified as old (Bangar) and new (Khadar).

    1 mark

  4. Bangar has more kankar nodules, while Khadar has finer particles and is more fertile.

    1 mark

  5. The soil is rich in potash, phosphoric acid and lime, ideal for sugarcane, paddy, wheat and other cereals and pulses. Being fertile, these regions are intensively cultivated and densely populated.

    1 mark

Answer: Alluvial soil: deposited by Himalayan rivers, sand-silt-clay mix, Bangar and Khadar types, rich in potash, phosphoric acid and lime, very fertile.

Where the marks are

  • Formed by deposition by Indus, Ganga, Brahmaputra; composition (1 mark)
  • Particle size varies with location (1 mark)
  • Classified as Bangar and Khadar (1 mark)
  • Differences in kankar and fertility (1 mark)
  • Nutrients, suitable crops, dense population (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Resources and Development, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 32/6/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.