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

Which soil type is known for its coarse texture, low water-holding capacity, and rapid drainage?

  1. Sandy soil

  2. Clayey soil

  3. Silty soil

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

Sandy soil has a coarse texture, low water-holding capacity, and rapid drainage due to its large particle size and loose structure.

Multiple choice

What is the layer of soil or rock beneath the Earth's surface that contains groundwater called?

  1. Aquifer

  2. Water table

  3. Capillary zone

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

An aquifer is a layer of rock or soil that contains groundwater and can yield a significant amount of water.

Multiple choice

What is the zone above the water table where the soil or rock contains some water, but not enough to saturate all the pores and cracks called?

  1. Saturated zone

  2. Unsaturated zone

  3. Aquifer

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

The unsaturated zone is the region above the water table where the soil or rock contains some water, but not enough to saturate all the pores and cracks.

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 are only three main soil horizons: O horizon (organic matter), A horizon (topsoil), and B horizon (subsoil). The C horizon is the parent material from which the soil has formed.

Multiple choice

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

  1. Sandy

  2. Silty

  3. Clayey

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

Stony is not a type of soil texture. Soil texture refers to the relative proportions of sand, silt, and clay in a soil.

Multiple choice

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

  1. Crumb structure

  2. Platy structure

  3. Prismatic structure

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

Spherical structure is not a type of soil structure. Soil structure refers to the arrangement of soil particles into aggregates.

Multiple choice

What is soil texture?

  1. The relative proportions of sand, silt, and clay in a soil

  2. The arrangement of soil particles into aggregates

  3. The ability of a soil to hold water

  4. The amount of organic matter in a soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soil texture is determined by the relative proportions of sand, silt, and clay particles in a soil. Sand particles are the largest, followed by silt particles, and then clay particles.

Multiple choice

What is soil structure?

  1. The arrangement of soil particles into aggregates

  2. The relative proportions of sand, silt, and clay in a soil

  3. The ability of a soil to hold water

  4. The amount of organic matter in a soil
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Soil structure refers to the arrangement of soil particles into aggregates. These aggregates can be various shapes and sizes, and they can affect the soil's porosity, water-holding capacity, and drainage.

Multiple choice

Which soil texture has the largest particles?

  1. Sand

  2. Silt

  3. Clay

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

Sand particles are the largest of the three soil texture classes. They are typically visible to the naked eye and feel gritty when rubbed between the fingers.

Multiple choice

Which soil texture has the smallest particles?

  1. Sand

  2. Silt

  3. Clay

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

Clay particles are the smallest of the three soil texture classes. They are not visible to the naked eye and feel smooth when rubbed between the fingers.

Multiple choice

Which soil texture is best for plant growth?

  1. Sand

  2. Silt

  3. Clay

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

Loam is a soil texture that contains a mixture of sand, silt, and clay. It is considered to be the best soil texture for plant growth because it provides a good balance of drainage and water-holding capacity.

Multiple choice

What is the term for a soil that has a high percentage of sand?

  1. Sandy soil

  2. Silty soil

  3. Clayey soil

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

A soil that has a high percentage of sand is called a sandy soil. Sandy soils are typically well-drained and have a low water-holding capacity.

Multiple choice

What is the term for a soil that has a high percentage of silt?

  1. Sandy soil

  2. Silty soil

  3. Clayey soil

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

A soil that has a high percentage of silt is called a silty soil. Silty soils are typically well-drained and have a moderate water-holding capacity.

Multiple choice

What is the term for a soil that has a high percentage of clay?

  1. Sandy soil

  2. Silty soil

  3. Clayey soil

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

A soil that has a high percentage of clay is called a clayey soil. Clayey soils are typically poorly drained and have a high water-holding capacity.

Multiple choice

What is the term for a soil that has a mixture of sand, silt, and clay?

  1. Sandy soil

  2. Silty soil

  3. Clayey soil

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

A soil that has a mixture of sand, silt, and clay is called a loamy soil. Loamy soils are typically well-drained and have a moderate water-holding capacity.