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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 type is known for its high acidity and is commonly found in the northeastern states of India?

  1. Black soil

  2. Red soil

  3. Laterite soil

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

Acidic soil is characterized by its high acidity and is commonly found in the northeastern states of India. It is derived from the weathering of acidic rocks and is generally less fertile than other soil types.

Multiple choice

What is the primary characteristic of saline soil, which makes it challenging for agriculture?

  1. High clay content

  2. Poor drainage

  3. High organic matter content

  4. High salt content
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Saline soil is characterized by its high salt content, which can hinder plant growth and make it challenging for agriculture. This soil type is commonly found in coastal areas and regions with poor drainage.

Multiple choice

Which soil type is known for its dark color and is commonly found in the floodplains of rivers?

  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 known for its dark color and is commonly found in the floodplains of rivers. It is formed by the deposition of sediments brought by rivers during flooding and is generally highly fertile.

Multiple choice

What is the primary factor responsible for the formation of laterite soil in India?

  1. High rainfall

  2. Alkaline conditions

  3. Iron oxide content

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

Laterite soil is primarily formed under conditions of high rainfall and intense leaching. This soil type is characterized by its hard, impervious layer and is commonly found in the coastal regions of India.

Multiple choice

Which soil type is known for its high organic matter content and is commonly found in marshy areas?

  1. Black soil

  2. Red soil

  3. Laterite soil

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

Peaty soil is known for its high organic matter content and is commonly found in marshy areas. It is formed from the accumulation of partially decayed plant material and is generally acidic in nature.

Multiple choice

Which of the following is a common landform found in areas of biological weathering?

  1. Termite mounds

  2. Ant hills

  3. Earthworm burrows

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

Termite mounds, ant hills, and earthworm burrows are all common landforms found in areas of biological weathering. Termite mounds are large structures built by termites out of soil and other materials. Ant hills are smaller structures built by ants out of soil and other materials. Earthworm burrows are tunnels dug by earthworms in the soil.

Multiple choice

Which of the following is not a type of soil?

  1. Sandy soil

  2. Clay soil

  3. Loam soil

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

Peat soil is not a type of soil, but rather a type of organic matter that is found in wetlands.

Multiple choice

Which of the following is not a type of 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

There is no D horizon in soil.

Multiple choice

Which of the following is not a type of soil texture?

  1. Sandy

  2. Clayey

  3. Loamy

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

Stony is not a type of soil texture.

Multiple choice

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

  1. Granular

  2. Blocky

  3. Prismatic

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

Laminar is not a type of soil structure.

Multiple choice

Which soil classification system is widely used 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 primary soil classification system used in the country. It is based on the USDA Soil Taxonomy system, but with modifications to suit Indian conditions.

Multiple choice

What is the basic unit of soil classification in the Soil Taxonomy of India?

  1. Soil Series

  2. Soil Type

  3. Soil Phase

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

The basic unit of soil classification in the Soil Taxonomy of India is the soil series. A soil series is a group of soils that have similar characteristics in terms of texture, structure, mineralogy, and drainage.

Multiple choice

How many soil orders are recognized in the Soil Taxonomy of India?

  1. 10

  2. 12

  3. 15

  4. 18
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

There are 12 soil orders recognized in the Soil Taxonomy of India. These are: Entisols, Inceptisols, Vertisols, Aridisols, Mollisols, Spodosols, Alfisols, Ultisols, Oxisols, Histosols, Andisols, and Gelisols.

Multiple choice

Which soil order is characterized by the presence of a thick, dark-colored surface horizon rich in organic matter?

  1. Entisols

  2. Inceptisols

  3. Mollisols

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

Mollisols are characterized by the presence of a thick, dark-colored surface horizon rich in organic matter. These soils are typically found in grasslands and prairies.

Multiple choice

Which soil order is characterized by the presence of a hardpan layer that restricts root penetration?

  1. Aridisols

  2. Vertisols

  3. Ultisols

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

Aridisols are characterized by the presence of a hardpan layer that restricts root penetration. These soils are typically found in dry climates.