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 fertility and ability to retain moisture?

  1. Sandy soil

  2. Clayey soil

  3. Loam soil

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

Loam soil is a well-balanced soil type that contains a mixture of sand, clay, and silt, providing good drainage, water-holding capacity, and nutrient retention.

Multiple choice

Which type of soil is commonly found in arid and semi-arid regions?

  1. Sandy soil

  2. Clayey soil

  3. Loam soil

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

Sandy soil is commonly found in arid and semi-arid regions due to its low water-holding capacity and high drainage rate.

Multiple choice

Which soil type is known for its high acidity and low fertility?

  1. Sandy soil

  2. Clayey soil

  3. Loam soil

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

Laterite soil is known for its high acidity and low fertility due to the leaching of nutrients and the accumulation of iron and aluminum oxides.

Multiple choice

Which soil type is known for its high clay content and poor drainage?

  1. Sandy soil

  2. Clayey soil

  3. Loam soil

  4. Laterite soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Clayey soil is known for its high clay content and poor drainage due to the small size and tightly packed nature of clay particles.

Multiple choice

Which soil classification system is widely used in the United States?

  1. Unified Soil Classification System (USCS).

  2. American Association of State Highway and Transportation Officials (AASHTO) Soil Classification System.

  3. International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) Soil Classification System.

  4. British Standards Institution (BSI) Soil Classification System.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Unified Soil Classification System (USCS) is commonly used in the United States for classifying soils based on their grain size distribution, plasticity, and other properties.

Multiple choice

Which type of soil is known for its high plasticity and expansive behavior?

  1. Sand.

  2. Clay.

  3. Gravel.

  4. Silt.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Clay is a fine-grained soil known for its high plasticity and expansive behavior, meaning it can undergo significant volume changes with changes in moisture content.

Multiple choice

Which type of soil is known for its coarse texture and high permeability?

  1. Sand.

  2. Clay.

  3. Gravel.

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

Sand is a coarse-grained soil known for its high permeability and relatively low plasticity.

Multiple choice

Which soil type is best suited for olive cultivation?

  1. Well-drained, calcareous soil

  2. Heavy clay soil

  3. Sandy soil

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

Olive trees prefer well-drained, calcareous soil with a pH between 6 and 8.

Multiple choice

Which of the following is a characteristic feature of mountain soils?

  1. High organic matter content

  2. Deep soil profile

  3. Well-developed horizons

  4. All of the above
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Mountain soils are typically shallow, have low organic matter content, and lack well-developed horizons due to the steep slopes and erosion.

Multiple choice

What is the primary factor responsible for the formation of mountain soils?

  1. Altitude

  2. Climate

  3. Vegetation

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

Altitude is the primary factor that influences the formation of mountain soils. It affects temperature, precipitation, and vegetation, which in turn shape the soil properties.

Multiple choice

What is the dominant soil texture in mountain soils?

  1. Sandy

  2. Silty

  3. Clayey

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

Mountain soils often have a loamy texture, which is a mixture of sand, silt, and clay particles, providing a balance of drainage and water-holding capacity.

Multiple choice

What is the primary parent material for mountain soils?

  1. Bedrock

  2. Alluvium

  3. Loess

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

Mountain soils are primarily derived from the weathering of bedrock, which is the solid rock that forms the foundation of mountains.

Multiple choice

Which of the following is a common soil order found in mountain regions?

  1. Entisols

  2. Inceptisols

  3. Alfisols

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

Entisols are common in mountain regions, characterized by young, undeveloped soils with minimal horizon development.

Multiple choice

Which type of soil is most susceptible to wind erosion?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

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

Sandy soil, due to its loose and fine texture, is most susceptible to wind erosion as it can be easily carried away by strong winds.

Multiple choice

Which type of soil is most susceptible to water erosion?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

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

Silt soil, due to its fine texture and low infiltration rate, is most susceptible to water erosion as it can be easily detached and carried away by water.