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

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Q: 45 (CDS-II/2016)

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.

question_subject: 

Geography

question_exam: 

CDS-II

stats: 

0,49,180,40,38,81,70

keywords: 

{'soil': [7, 0, 4, 7], 'black soils': [1, 0, 0, 1], 'alluvial soils': [1, 0, 0, 1], 'laterite soils': [1, 0, 0, 3], 'nitrogen content': [0, 1, 0, 0], 'nitrogen': [1, 1, 0, 2], 'aluminium': [1, 0, 3, 2], 'lime': [1, 0, 5, 12], 'potassium': [1, 0, 0, 2]}

The correct answer is option 3, which states that statements 2 and 3 are correct. Let`s analyze each statement to understand why.

1. Alluvial soils are rich in nitrogen content: This statement is incorrect. Alluvial soils are formed by the deposition of sediments carried by rivers, and they are generally rich in minerals like potassium, calcium, and magnesium, but not necessarily nitrogen.

2. Black soils are rich in iron and lime but deficient in nitrogen: This statement is correct. Black soils, also known as regur soils, are formed from weathered volcanic rocks and are known for their high fertility. They are rich in iron, lime, and other minerals, but they are deficient in nitrogen.

3. Laterite soils are rich in iron and aluminium but deficient in nitrogen and potassium: This statement is also correct. Laterite soils are formed in tropical regions with high rainfall and intense weathering. They are rich in iron and aluminium oxides but lack essential nutrients like nitrogen and potassium.

To summarize, statement 1 is incorrect, but statements 2 and 3 are correct. Therefore, the correct answer is option 3.

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