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

  1. O Horizon

  2. A Horizon

  3. B Horizon

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

The A Horizon, also known as the topsoil, is the uppermost layer of soil and is characterized by the accumulation of organic matter and nutrients, giving it a dark color and fertile texture.

Multiple choice

The USDA soil classification system is based on:

  1. Soil texture

  2. Soil structure

  3. Soil color

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

The USDA soil classification system primarily uses soil texture, which refers to the relative proportions of sand, silt, and clay in the soil, to categorize soils into different classes.

Multiple choice

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

  1. Granular

  2. Prismatic

  3. Platy

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

Soil structure refers to the arrangement of soil particles into aggregates. Granular, prismatic, and platy are all types of soil structure, while amorphous is not a recognized soil structure type.

Multiple choice

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

  1. Black Cotton Soil

  2. Red Soil

  3. Laterite Soil

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

Black Cotton Soil is a type of soil found in the black soil region of India.

Multiple choice

Which of the following is a national level soil database in India?

  1. National Soil Information System (NSIS)

  2. Soil and Land Use Survey of India (SLUSI)

  3. All India Soil and Land Use Survey (AISLUS)

  4. National Bureau of Soil Survey and Land Use Planning (NBSS&LUP)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The National Soil Information System (NSIS) is a national level soil database in India. It contains information on soil properties, soil classification, and soil management practices. NSIS is used for various applications such as agricultural planning, land use planning, and soil conservation.

Multiple choice

Which grain storage method involves storing grains in underground structures?

  1. Silo Storage

  2. Bulk Storage

  3. Underground Storage

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

Underground storage involves storing grains in underground structures to maintain a stable temperature and protect against pests.

Multiple choice

Which of the following is NOT a type of soil?

  1. Sand

  2. Clay

  3. Silt

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

Gravel is a type of rock, not soil.

Multiple choice

Which type of foundation is commonly used for structures built on soft or loose soil?

  1. Spread footing

  2. Pile foundation

  3. Mat foundation

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

Pile foundations are commonly used for structures built on soft or loose soil because they transfer the load of the structure to deeper, more stable layers of soil.

Multiple choice

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

  1. Atterberg limits test

  2. Standard penetration test

  3. Consolidation test

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

pH test is not a soil test, it is a water quality test.

Multiple choice

Which soil texture class is characterized by a balanced proportion of sand, silt, and clay?

  1. Sandy soil

  2. Silty soil

  3. Clayey soil

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

Loam soil has a balanced texture, with approximately equal proportions of sand, silt, and clay, resulting in good drainage and water-holding capacity.

Multiple choice

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

  1. Alluvial soil

  2. Black soil

  3. Red soil

  4. Laterite soil

  5. Desert soil
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Laterite soil is not a major soil type in India. It is found in some parts of the country, but it is not as common as the other four soil types.

Multiple choice

Which soil type is known for its high fertility and is commonly found in the Deccan Plateau region of India?

  1. Alluvial soil

  2. Black soil

  3. Red soil

  4. Laterite soil

  5. Desert soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Black soil, also known as regur soil, is known for its high fertility and is commonly found in the Deccan Plateau region of India. It is derived from volcanic rocks and is rich in nutrients such as calcium, magnesium, and potassium.

Multiple choice

Which soil type is characterized by its reddish color and is commonly found in the eastern and southern parts of India?

  1. Alluvial soil

  2. Black soil

  3. Red soil

  4. Laterite soil

  5. Desert soil
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Red soil is characterized by its reddish color and is commonly found in the eastern and southern parts of India. It is derived from crystalline rocks and is rich in iron oxides, which give it its characteristic color.

Multiple choice

Which soil type is known for its poor fertility and is commonly found in arid and semi-arid regions of India?

  1. Alluvial soil

  2. Black soil

  3. Red soil

  4. Laterite soil

  5. Desert soil
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Desert soil is known for its poor fertility and is commonly found in arid and semi-arid regions of India. It is characterized by a lack of organic matter and nutrients, and it is often saline or alkaline.

Multiple choice

Which of the following is a key factor in determining the suitability of a soil for a particular crop?

  1. Soil texture

  2. Soil structure

  3. Soil pH

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

Soil texture, soil structure, and soil pH are all key factors in determining the suitability of a soil for a particular crop. Soil texture refers to the size and shape of the soil particles. Soil structure refers to the way the soil particles are arranged. Soil pH refers to the acidity or alkalinity of the soil.