Change set

Pick exam & year, then Go.

Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q75 (NDA-I/2024) Geography › Indian Physical Geography Official Key

Consider the following statements regarding soils : 1. Soils having a very high content of sodium and calcium and pH of more than 7·0 are alkaline soils. 2. Black cotton soil had developed on the Deccan basaltic lava under hot and humid conditions. 3. Laterite soils are characterised by a deep weathered layer from which silica has been leached. Which of the statements given above is/are correct ?

Result
Your answer: —  ·  Correct: C
Explanation

Statement 1 is incorrect: Alkaline (sodic) soils are characterised by a high proportion of exchangeable sodium and a high pH (often > 8.0). However, they typically have a low content of soluble calcium, because calcium precipitates out as calcium carbonate at high pH levels. In fact, adding calcium (via gypsum) is the standard treatment to reclaim alkaline soils.

Statement 2 is correct: Black cotton soil (Regur soil) is formed from the weathering of Deccan basaltic lava. The chemical decomposition of the parent volcanic rock into fine clayey soils was facilitated by hot temperatures and sufficient moisture (interpreted in this context as humid/sub-humid conditions).

Statement 3 is correct: Laterite soils develop in areas with high temperatures and heavy rainfall. This climate causes intense leaching (desilication), washing away silica and leaving behind a deeply weathered layer rich in iron and aluminium oxides.

Therefore, only statements 2 and 3 are correct.

How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
20%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-II · 2016 · Q45 Relevance score: 2.17

Which of the following statements regarding soil is/are correct? 1. Alluvial soils are rich in nitrogen content. 2. Black soils are rich in iron and lime but deficient in nitrogen. 3. Laterite soils are rich in iron and aluminium but deficient in nitrogen and potassium. Select the correct answer using the code given below.

IAS · 2018 · Q82 Relevance score: 1.99

With reference to agricultural soils, consider the following statements : 1. A high content of organic matter in soil drastically reduces its water holding capacity. 2. Soil does not play any role in the sulphur cycle. 3. Irrigation over a period of time can contribute to the salinization of some agricultural lands. Which of the statements given above is/are correct ?

CDS-I · 2016 · Q7 Relevance score: 1.01

Consider the following statements regarding laterite soils of India : 1. Laterite soils are generally red in colour 2. Laterite soils are rich in nitrogen and potash 3. Laterite soils are well developed in Rajasthan and UP 4. Tapioca and cashew nuts grow well in this soil Which of the statements given above is / are correct?

CDS-I · 2011 · Q86 Relevance score: 0.33

Consider the following statements about black soil of India : 1. Black soil becomes sticky when it is wet. 2. Black soil contains adequate nitrogen as well as phosphorus required for the growth of plants. Which of the statements given above is/are correct?