Environmental Studies ยท Geography

Soil Science

1,499 Questions

Soil Science examines the formation, classification, and properties of soil as a critical natural resource. This hub offers practice questions covering soil horizons, soil types like laterite and black soil, and regional soil characteristics. The content is highly useful for agriculture exams and civil services preparation.

Soil typesSoil horizonsSoil formation factorsAgricultural soil requirementsIndian soilsForest and mountain soils

Soil Science Questions

Multiple choice

Which soil type is known for its high clay content and is often found in river deltas and floodplains?

  1. Black soil

  2. Red soil

  3. Laterite soil

  4. Clayey soil
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Clayey soil is characterized by its high clay content, which results in poor drainage and waterlogging, making it less suitable for agriculture.

Multiple choice

Which of the following is NOT a major soil type:

  1. Andosols

  2. Spodosols

  3. Vertisols

  4. Oxisols
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxisols are not a major soil type, but rather a suborder of Ultisols.

Multiple choice

Which soil type is characterized by a thick, dark surface horizon rich in organic matter?

  1. Mollisols

  2. Alfisols

  3. Ultisols

  4. Inceptisols
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mollisols are characterized by a thick, dark surface horizon rich in organic matter, which is formed under conditions of moderate rainfall and temperature.

Multiple choice

Which soil type is characterized by a reddish or brownish color and a high content of iron oxides?

  1. Alfisols

  2. Ultisols

  3. Oxisols

  4. Spodosols
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alfisols are characterized by a reddish or brownish color and a high content of iron oxides, which are formed under conditions of moderate rainfall and temperature.

Multiple choice

Which soil type is characterized by a low pH and a high content of aluminum and iron oxides?

  1. Ultisols

  2. Oxisols

  3. Spodosols

  4. Andosols
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ultisols are characterized by a low pH and a high content of aluminum and iron oxides, which are formed under conditions of high rainfall and temperature.

Multiple choice

Which soil type is characterized by a high content of organic matter and is often found in wetlands?

  1. Histosols

  2. Andosols

  3. Spodosols

  4. Inceptisols
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Histosols are characterized by a high content of organic matter and are often found in wetlands, where they are formed under conditions of poor drainage.

Multiple choice

Which soil type is characterized by a light-colored surface horizon and a subsoil that is rich in clay?

  1. Alfisols

  2. Ultisols

  3. Spodosols

  4. Inceptisols
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Spodosols are characterized by a light-colored surface horizon and a subsoil that is rich in clay, which is formed under conditions of high rainfall and cool temperatures.

Multiple choice

Which soil type is characterized by a dark-colored surface horizon and a subsoil that is rich in calcium carbonate?

  1. Mollisols

  2. Alfisols

  3. Vertisols

  4. Andosols
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vertisols are characterized by a dark-colored surface horizon and a subsoil that is rich in calcium carbonate, which is formed under conditions of high rainfall and temperature.

Multiple choice

Which soil type is characterized by a dark-colored surface horizon and a subsoil that is rich in volcanic ash?

  1. Andosols

  2. Spodosols

  3. Inceptisols

  4. Oxisols
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Andosols are characterized by a dark-colored surface horizon and a subsoil that is rich in volcanic ash, which is formed under conditions of high rainfall and temperature.

Multiple choice

Which soil type is characterized by a high content of salt and is often found in arid and semi-arid regions?

  1. Saline soils

  2. Sodic soils

  3. Alkaline soils

  4. Acidic soils
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Saline soils are characterized by a high content of salt and are often found in arid and semi-arid regions, where they are formed under conditions of poor drainage and high evaporation.

Multiple choice

Which soil type is characterized by a high pH and a high content of sodium ions?

  1. Sodic soils

  2. Saline soils

  3. Alkaline soils

  4. Acidic soils
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sodic soils are characterized by a high pH and a high content of sodium ions, which are formed under conditions of poor drainage and high evaporation.

Multiple choice

Which soil type is characterized by a high pH and a high content of calcium carbonate?

  1. Alkaline soils

  2. Sodic soils

  3. Saline soils

  4. Acidic soils
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Alkaline soils are characterized by a high pH and a high content of calcium carbonate, which are formed under conditions of low rainfall and high evaporation.

Multiple choice

Which soil type is characterized by a low pH and a high content of hydrogen ions?

  1. Acidic soils

  2. Alkaline soils

  3. Sodic soils

  4. Saline soils
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Acidic soils are characterized by a low pH and a high content of hydrogen ions, which are formed under conditions of high rainfall and low evaporation.

Multiple choice

Which soil property is most important for determining the suitability of a soil for agriculture?

  1. Texture

  2. Structure

  3. pH

  4. Organic matter content
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soil texture is the most important soil property for determining the suitability of a soil for agriculture, as it affects the soil's ability to hold water and nutrients, as well as its drainage and aeration.

Multiple choice

Which of the following is not a major soil type?

  1. Sand

  2. Silt

  3. Clay

  4. Gravel
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Gravel is not a major soil type because it is not composed of fine-grained particles like sand, silt, and clay.