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

Laterite soils are known for their:

  1. Good Drainage

  2. Poor Drainage

  3. High Water-Holding Capacity

  4. Low Water-Holding Capacity
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Laterite soils typically have poor drainage due to their high clay content and low organic matter content.

Multiple choice

Which of the following is a common method for improving the drainage of laterite soils?

  1. Liming

  2. Fertilization

  3. Tillage

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

Terracing is a common method to improve the drainage of laterite soils by creating level terraces to reduce erosion and improve water flow.

Multiple choice

Laterite soils are often associated with which type of climate?

  1. Temperate

  2. Tropical Monsoon

  3. Mediterranean

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

Laterite soils are typically associated with tropical monsoon climates, characterized by high temperatures, heavy rainfall, and distinct wet and dry seasons.

Multiple choice

What is permafrost?

  1. A layer of soil that remains frozen for two or more consecutive years

  2. A layer of soil that remains frozen for less than two consecutive years

  3. A layer of soil that remains frozen for more than ten consecutive years

  4. A layer of soil that remains frozen for more than twenty consecutive years
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Permafrost is defined as a layer of soil, rock, or sediment that remains frozen for at least two consecutive years.

Multiple choice

Which soil property is most vulnerable to changes in global temperature?

  1. Soil texture

  2. Soil structure

  3. Soil pH

  4. Soil organic matter content
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Soil organic matter is highly sensitive to changes in global temperature. Rising temperatures accelerate the decomposition of organic matter, leading to its depletion and the release of carbon dioxide into the atmosphere.

Multiple choice

Which soil property is most affected by changes in precipitation patterns?

  1. Soil texture

  2. Soil structure

  3. Soil moisture content

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

Changes in precipitation patterns, such as increased frequency of droughts or heavy rainfall events, can significantly affect soil moisture content, leading to changes in soil properties and ecosystem functioning.

Multiple choice

Which type of soil is most prone to settlement?

  1. Sand

  2. Clay

  3. Gravel

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

Clay is a fine-grained soil that is highly compressible and prone to settlement when subjected to load.

Multiple choice

What is the dominant soil type in the taiga?

  1. Podzol

  2. Spodosol

  3. Mollisol

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

The dominant soil type in the taiga is Podzol. This is a type of soil that is characterized by a thick layer of organic matter, a thin layer of mineral soil, and a hardpan layer.

Multiple choice

What is the most common type of soil found in rainforests?

  1. Clay

  2. Sand

  3. Loam

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

Laterite is the most common type of soil found in rainforests. It is a reddish-brown soil that is rich in iron and aluminum oxides. Laterite is formed by the weathering of rocks in hot, humid climates.

Multiple choice

Which soil texture class is characterized by a high proportion of sand particles, resulting in a coarse and gritty feel?

  1. Sandy

  2. Silty

  3. Clayey

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

Sandy soils are dominated by sand particles, which are larger in size compared to silt and clay particles. They have a coarse and gritty texture and drain quickly due to their high porosity.

Multiple choice

Which soil texture class is known for its smooth and floury texture due to a high proportion of silt particles?

  1. Sandy

  2. Silty

  3. Clayey

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

Silty soils are characterized by a high content of silt particles, which are smaller than sand particles but larger than clay particles. They have a smooth and floury texture and hold more water than sandy soils.

Multiple choice

Which soil texture class is composed primarily of clay particles, resulting in a sticky and cohesive texture when wet?

  1. Sandy

  2. Silty

  3. Clayey

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

Clayey soils are dominated by clay particles, which are the smallest soil particles. They have a sticky and cohesive texture when wet and can become hard and cracked when dry.

Multiple choice

Which soil texture class is a combination of sand, silt, and clay particles in relatively equal proportions, resulting in a well-balanced texture?

  1. Sandy

  2. Silty

  3. Clayey

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

Loamy soils contain a balanced mixture of sand, silt, and clay particles. They have a moderate texture, good drainage, and water-holding capacity, making them suitable for a wide range of agricultural crops.

Multiple choice

In India, which region is known for its extensive black soil cover?

  1. Northern Plains

  2. Deccan Plateau

  3. Eastern Coastal Plains

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

The Deccan Plateau region in central and southern India is famous for its black soil cover. These soils are derived from volcanic rocks and are rich in clay minerals, giving them a dark color and a sticky texture.

Multiple choice

Which soil texture class is often associated with arid and semi-arid regions due to its low water-holding capacity?

  1. Sandy

  2. Silty

  3. Clayey

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

Sandy soils have a low water-holding capacity due to their large pore spaces. They are common in arid and semi-arid regions, where rainfall is scarce and evaporation rates are high.