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

What is the term for the arrangement of soil particles into aggregates?

  1. Soil texture

  2. Soil structure

  3. Soil porosity

  4. Soil water-holding capacity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The term for the arrangement of soil particles into aggregates is soil structure.

Multiple choice

What are the three main types of soil structure?

  1. Granular, platy, and blocky

  2. Prismatic, columnar, and platy

  3. Spherical, cubical, and octahedral

  4. Massive, single-grained, and aggregated
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The three main types of soil structure are granular, platy, and blocky.

Multiple choice

Which soil structure is characterized by rounded or spherical aggregates?

  1. Granular

  2. Platy

  3. Blocky

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

Granular soil structure is characterized by rounded or spherical aggregates.

Multiple choice

Which soil structure is characterized by flat or plate-like aggregates?

  1. Granular

  2. Platy

  3. Blocky

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

Platy soil structure is characterized by flat or plate-like aggregates.

Multiple choice

Which soil structure is characterized by angular or blocky aggregates?

  1. Granular

  2. Platy

  3. Blocky

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

Blocky soil structure is characterized by angular or blocky aggregates.

Multiple choice

Which soil structure is characterized by a lack of distinct aggregates?

  1. Granular

  2. Platy

  3. Blocky

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

Massive soil structure is characterized by a lack of distinct aggregates.

Multiple choice

Which of the following is NOT a factor influencing soil formation?

  1. Climate

  2. Parent material

  3. Topography

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

Human activity is not a natural factor that influences soil formation. It is an external factor that can modify the soil properties and characteristics.

Multiple choice

Which soil horizon is characterized by the accumulation of organic matter and nutrients?

  1. A horizon

  2. B horizon

  3. C horizon

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

The A horizon, also known as the topsoil, is the uppermost layer of the soil profile and is characterized by the accumulation of organic matter, nutrients, and microorganisms.

Multiple choice

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

  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
A Correct answer
Explanation

The USDA Soil Taxonomy is the soil classification system developed by the United States Department of Agriculture (USDA) and is widely used in the United States for soil surveys and land management.

Multiple choice

The soil texture is primarily determined by the relative proportions of:

  1. Sand

  2. Silt

  3. Clay

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

Soil texture is determined by the relative proportions of sand, silt, and clay particles in the soil. Organic matter content can also influence soil texture, but it is not a primary determinant.

Multiple choice

Which soil structure is characterized by the formation of distinct, blocky or angular aggregates?

  1. Prismatic

  2. Columnar

  3. Granular

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

Prismatic soil structure is characterized by the formation of distinct, blocky or angular aggregates that are separated by vertical cracks or planes of weakness.

Multiple choice

Which soil horizon is characterized by the accumulation of clay minerals and other fine particles?

  1. A horizon

  2. B horizon

  3. C horizon

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

The B horizon, also known as the subsoil, is characterized by the accumulation of clay minerals and other fine particles, which are transported from the A horizon by water movement.

Multiple choice

Which soil classification system is based on the concept of soil orders?

  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
A Correct answer
Explanation

The USDA Soil Taxonomy is based on the concept of soil orders, which are the highest level of classification and are defined by the presence of diagnostic horizons or other soil characteristics.

Multiple choice

Which soil horizon is characterized by the presence of bedrock or other hard material?

  1. A horizon

  2. B horizon

  3. C horizon

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

The R horizon, also known as the bedrock horizon, is characterized by the presence of bedrock or other hard material that is resistant to weathering and soil formation.

Multiple choice

The process of soil formation from volcanic ash is known as:

  1. Andosolization

  2. Podzolization

  3. Laterization

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

Andosolization is the process of soil formation from volcanic ash, which results in the development of soils with high organic matter content, dark color, and unique physical and chemical properties.