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 classification system is based on the concept of soil groups?

  1. USDA Soil Taxonomy

  2. FAO Soil Classification System

  3. World Reference Base for Soil Resources

  4. Canadian System of Soil Classification
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The FAO Soil Classification System is based on the concept of soil groups, which are defined by a combination of soil properties and characteristics.

Multiple choice

Which soil type is most vulnerable to salinization due to climate change?

  1. Sandy soils

  2. Clayey soils

  3. Loamy soils

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

Sandy soils are most vulnerable to salinization due to climate change because they have a low water-holding capacity and are more prone to leaching. When saline water, such as seawater or groundwater, comes into contact with sandy soil, it can easily infiltrate and accumulate, leading to salinization.

Multiple choice

Which soil type is most susceptible to compaction due to climate change?

  1. Sandy soils

  2. Clayey soils

  3. Loamy soils

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

Clayey soils are most susceptible to compaction due to climate change because they have a high clay content and are more prone to shrinking and swelling. When clayey soils dry out due to climate change, they can become very hard and compacted, which can restrict root growth and water infiltration.

Multiple choice

Which soil type is most resilient to climate change?

  1. Sandy soils

  2. Clayey soils

  3. Loamy soils

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

Loamy soils are most resilient to climate change because they have a balanced texture and structure. They contain a mixture of sand, silt, and clay, which allows for good drainage and water-holding capacity. Loamy soils are also less prone to compaction and erosion.

Multiple choice

What is permafrost?

  1. Soil that remains frozen for two or more consecutive years

  2. Soil that remains frozen for less than two consecutive years

  3. Soil that remains frozen for more than five consecutive years

  4. Soil that remains frozen for more than ten consecutive years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Permafrost is soil that remains frozen for two or more consecutive years. It is found in regions with very cold climates, such as the Arctic and Antarctic.

Multiple choice

Which soil texture is known for its excellent drainage and aeration?

  1. Sandy

  2. Clayey

  3. Silty

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

Sandy soil has large particles that allow water and air to flow through easily, resulting in good drainage and aeration.

Multiple choice

Which soil type is known for its high water-holding capacity and nutrient retention?

  1. Sandy

  2. Clayey

  3. Silty

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

Clayey soil has small particles that hold water and nutrients tightly, resulting in high water-holding capacity and nutrient retention.

Multiple choice

Which soil type is known for its balanced texture, allowing for both good drainage and water retention?

  1. Sandy

  2. Clayey

  3. Silty

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

Loamy soil has a mixture of sand, silt, and clay, providing a balanced texture that allows for both good drainage and water retention.

Multiple choice

Which soil type is known for its poor drainage and aeration, often leading to waterlogging?

  1. Sandy

  2. Clayey

  3. Silty

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

Clayey soil has small particles that hold water tightly, resulting in poor drainage and aeration, often leading to waterlogging.

Multiple choice

Which of the following is NOT a type of terrace commonly used in agriculture?

  1. Bench terrace

  2. Contour terrace

  3. Broad-base terrace

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

Strip terraces are not a common type of terrace used in agriculture. The other options, bench terrace, contour terrace, and broad-base terrace, are widely used.

Multiple choice

Terracing and contour bunding are particularly important in areas with:

  1. Steep slopes

  2. Sandy soils

  3. Low rainfall

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

Terracing and contour bunding are crucial in areas with steep slopes to prevent soil erosion and conserve soil moisture.

Multiple choice

What is the primary factor determining the spacing between terraces?

  1. Slope of the land

  2. Soil type

  3. Rainfall intensity

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

The spacing between terraces is primarily determined by the slope of the land. Steeper slopes require closer spacing to effectively control erosion.

Multiple choice

Which of the following is NOT a suitable area for terracing and contour bunding?

  1. Steep slopes

  2. Sandy soils

  3. Low rainfall areas

  4. Areas with high soil erosion risk
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Sandy soils are not typically suitable for terracing and contour bunding due to their low water-holding capacity and susceptibility to wind erosion.

Multiple choice

Which of the following is an example of a texture gradient?

  1. The texture of a brick wall

  2. The texture of a grassy field

  3. The texture of a sandy beach

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

All of the examples provided are examples of texture gradients, which are depth cues that help us perceive depth in an image based on the changes in texture density.

Multiple choice

Which of the following is NOT a type of glacial till?

  1. Boulder clay

  2. Loess

  3. Till plain
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Loess is not a type of glacial till. It is a type of wind-blown sediment that is composed of fine-grained particles.