WBCS.LIVE practice question

The colour of alluvial soils varies from _________.

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. pale white to warm white
  2. light orange to dark orange
  3. orange to red
  4. light grey to ash grey

Correct answer and explanation

Correct answer: light grey to ash grey

Explanation: The correct answer is D. light grey to ash grey. Alluvial soils are formed by the deposition of sediments brought by rivers and are mostly found in river plains and deltas. Their colour generally varies from light grey to ash grey depending on the depth, moisture content, and presence of organic matter. These soils are rich in potash but poor in nitrogen and phosphorus. They are highly fertile and ideal for growing crops like wheat, rice, sugarcane, and cotton. Alluvial soils are the most widespread soil type in India.