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

Which soil order is characterized by the presence of a spodic horizon, which is a layer of accumulation of organic matter and aluminum?

  1. Alfisols

  2. Ultisols

  3. Oxisols

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

Spodosols are characterized by the presence of a spodic horizon, which is a layer of accumulation of organic matter and aluminum. These soils are typically found in forested areas.

Multiple choice

Which soil order is characterized by the presence of a clay-rich subsoil that is sticky and plastic when wet and hard when dry?

  1. Vertisols

  2. Alfisols

  3. Ultisols

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

Vertisols are characterized by the presence of a clay-rich subsoil that is sticky and plastic when wet and hard when dry. These soils are typically found in tropical and subtropical regions.

Multiple choice

Which soil order is characterized by the presence of a lateritic horizon, which is a layer of accumulation of iron and aluminum oxides?

  1. Alfisols

  2. Ultisols

  3. Oxisols

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

Oxisols are characterized by the presence of a lateritic horizon, which is a layer of accumulation of iron and aluminum oxides. These soils are typically found in tropical and subtropical regions.

Multiple choice

Which soil order is characterized by the presence of a histic horizon, which is a layer of accumulation of organic matter?

  1. Histosols

  2. Andisols

  3. Gelisols

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

Histosols are characterized by the presence of a histic horizon, which is a layer of accumulation of organic matter. These soils are typically found in wetlands.

Multiple choice

Which soil order is characterized by the presence of an andic horizon, which is a layer of accumulation of volcanic ash?

  1. Andisols

  2. Gelisols

  3. Spodosols

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

Andisols are characterized by the presence of an andic horizon, which is a layer of accumulation of volcanic ash. These soils are typically found in areas with volcanic activity.

Multiple choice

Which soil order is characterized by the presence of a gelisol horizon, which is a layer of perennially frozen soil?

  1. Gelisols

  2. Andisols

  3. Histosols

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

Gelisols are characterized by the presence of a gelisol horizon, which is a layer of perennially frozen soil. These soils are typically found in polar and subpolar regions.

Multiple choice

What is the purpose of soil classification?

  1. To group soils with similar characteristics

  2. To understand soil properties and behavior

  3. To aid in land use planning and management

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

Soil classification serves multiple purposes, including grouping soils with similar characteristics, understanding soil properties and behavior, and aiding in land use planning and management.

Multiple choice

What are some of the challenges associated with soil classification?

  1. The complexity and variability of soils

  2. The lack of standardized classification criteria

  3. The need for specialized knowledge and expertise

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

Soil classification faces challenges due to the complexity and variability of soils, the lack of standardized classification criteria, and the need for specialized knowledge and expertise.

Multiple choice

Which of the following is a common type of soil found in the Montane Climate Zone?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

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

Loam soil, a mixture of sand, silt, and clay, is commonly found in the Montane Climate Zone.

Multiple choice

Which of the following is a characteristic of humus?

  1. It is dark in color.

  2. It has a high cation exchange capacity.

  3. It is resistant to decomposition.

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

Humus is dark in color, has a high cation exchange capacity, and is resistant to decomposition.

Multiple choice

Which of the following is NOT a major source of soil pollution in India?

  1. Industrial waste

  2. Agricultural practices

  3. Deforestation

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

Natural weathering is a natural process that does not contribute to soil pollution.

Multiple choice

Which of the following is a major factor influencing soil fertility in India?

  1. Climate

  2. Soil Texture

  3. Soil pH

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

Soil fertility in India is influenced by a combination of factors including climate, soil texture, soil pH, and the presence of organic matter.

Multiple choice

Which soil texture is generally considered to be the most fertile?

  1. Sandy Soil

  2. Clayey Soil

  3. Loamy Soil

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

Loamy soil is a mixture of sand, silt, and clay in roughly equal proportions. It has good drainage and aeration, and it is able to hold both water and nutrients.

Multiple choice

Which nutrient is often deficient in Indian soils?

  1. Nitrogen

  2. Phosphorus

  3. Potassium

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

Nitrogen, phosphorus, and potassium are all essential nutrients for plant growth. They are often deficient in Indian soils due to factors such as leaching, erosion, and the removal of nutrients by crops.

Multiple choice

Which of the following is NOT a major soil type found in India?

  1. Black soil

  2. Red soil

  3. Laterite soil

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

Laterite soil is primarily found in tropical and subtropical regions, and it is not a major soil type in India.