Environmental Studies ยท Geography

Soil Science

1,537 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

How do dams and irrigation projects impact the phosphorus cycle?

  1. They increase phosphorus retention.

  2. They decrease phosphorus retention.

  3. They have no impact on phosphorus retention.

  4. They reverse the phosphorus cycle.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dams and irrigation projects can increase phosphorus retention by trapping sediment and preventing its downstream transport.

Multiple choice

Which component of soil is responsible for its ability to hold and release water?

  1. Sand

  2. Clay

  3. Organic matter

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

Clay particles have a high surface area and can hold a significant amount of water, making them responsible for the soil's ability to hold and release water.

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 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

How does altitude affect the characteristics of mountain soils?

  1. It increases soil temperature and moisture content.

  2. It decreases soil temperature and moisture content.

  3. It has no significant effect on soil temperature and moisture content.

  4. It varies depending on the specific mountain range.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As altitude increases, temperature and precipitation generally decrease, leading to cooler and drier conditions in mountain soils.

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.