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 most commonly used soil classification system in India?

  1. USDA Soil Taxonomy

  2. Soil Taxonomy of India

  3. FAO Soil Classification System

  4. World Reference Base for Soil Resources
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Soil Taxonomy of India is the most commonly used soil classification system in India. It is based on the USDA Soil Taxonomy, but it has been modified to suit Indian conditions.

Multiple choice

Which soil type is commonly found in the black soil region of India?

  1. Vertisols

  2. Alfisols

  3. Mollisols

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

Vertisols are commonly found in the black soil region of India. They are known for their high clay content, which makes them swell and shrink with changes in moisture content.

Multiple choice

What is the major soil type found in the alluvial plains of India?

  1. Entisols

  2. Inceptisols

  3. Alfisols

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

Entisols are the major soil type found in the alluvial plains of India. They are young soils that have not developed distinct horizons.

Multiple choice

Which soil type is characteristic of the desert regions of India?

  1. Aridisols

  2. Mollisols

  3. Spodosols

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

Aridisols are characteristic of the desert regions of India. They are characterized by low organic matter content and a lack of water.

Multiple choice

Which soil texture has the highest percentage of sand?

  1. Sandy loam

  2. Silty loam

  3. Clay loam

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

Sandy soil has the highest percentage of sand, followed by sandy loam, loam, silt loam, silty clay loam, clay loam, and clay.

Multiple choice

Which of the following is NOT a type of soil structure?

  1. Granular

  2. Blocky

  3. Prismatic

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

Massive is not a type of soil structure. The other options, granular, blocky, and prismatic, are all types of soil structure.

Multiple choice

The USDA soil classification system is based on:

  1. Soil texture

  2. Soil structure

  3. Soil color

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

The USDA soil classification system is based on soil texture, which is determined by the relative proportions of sand, silt, and clay in the soil.

Multiple choice

Which of the following is NOT a soil horizon?

  1. O horizon

  2. A horizon

  3. B horizon

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

D horizon is not a soil horizon. The other options, O horizon, A horizon, B horizon, and C horizon, are all soil horizons.

Multiple choice

Which of the following is NOT a type of soil model?

  1. Empirical models

  2. Mechanistic models

  3. Conceptual models

  4. Statistical models
Reveal answer Fill a bubble to check yourself
Correct answer
Explanation

Physical models are not a type of soil model. The other options, empirical models, mechanistic models, conceptual models, and statistical models, are all types of soil models.

Multiple choice

Which of the following is a characteristic of desert soils?

  1. High organic matter content

  2. Well-developed soil profile

  3. Alkaline pH

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

Desert soils typically have an alkaline pH due to the accumulation of salts and minerals in the soil.

Multiple choice

What is the term for the accumulation of salts and minerals in desert soils?

  1. Salinization

  2. Alkalinization

  3. Desertification

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Salinization is the process by which salts and minerals accumulate in desert soils, often leading to the formation of salt flats and playas.

Multiple choice

Which of the following is a common type of soil found in deserts?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

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

Sandy soil is a common type of soil found in deserts, formed from the accumulation and weathering of sand grains.

Multiple choice

Which of the following is a common type of soil found in deserts?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

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

Sandy soil is a common type of soil found in deserts, formed from the accumulation and weathering of sand grains.

Multiple choice

What is the primary soil type found in the Eastern Coastal Plains?

  1. Black soil

  2. Red soil

  3. Laterite soil

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

Alluvial soil is the primary soil type found in the Eastern Coastal Plains, which is formed by the deposition of sediments by rivers.

Multiple choice

Which of the following is NOT a primary soil texture class?

  1. Sand

  2. Silt

  3. Clay

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

Loam is a textural class that contains a mixture of sand, silt, and clay in relatively equal proportions. The primary soil texture classes are sand, silt, and clay.