The Layers Of Soil Quiz! Trivia

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| By Amtul Fatir

Amtul Fatir

Community Contributor

Quizzes Created: 1 | Total Attempts: 2,799

Questions: 10 | Attempts: 2,811 | Updated: Oct 4, 2024

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Get ready for The Layers of Soil Quiz! Soil is made up of three layers, with the first one being topsoil. The topsoil is made up of decomposed organic matter. For soil to be mature, it needs to have the three layers. Do you know which of the three is home to minerals and what the largest soil particles are? This quiz will help to test out how well you understand soil.

Questions and Answers

1.

Soil profile consists of four distinct soil layers. These layers are also referred to as _______________.
- A.
  
  Subsoil
- B.
  
  Bedrock
- C.
  
  Composition of soil
- D.
  
  Horizons
Correct Answer
D. Horizons

Explanation
The soil profile consists of four distinct soil layers, which are also referred to as horizons. These horizons, from top to bottom, are the O horizon, A horizon, B horizon, and C horizon. Each horizon has unique characteristics and composition, which play a crucial role in determining the soil's fertility and suitability for various purposes such as agriculture or construction.

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2.

O-horizon that just lies above the topsoil is rich in _______________.
- A.
  
  Humus
- B.
  
  Parent rock
- C.
  
  Water
- D.
  
  Minerals
Correct Answer
A. Humus

Explanation
The O-horizon, which is the topmost layer of soil, is rich in humus. Humus is a dark organic material that forms from the decomposition of plant and animal matter. It is a vital component of soil as it improves soil fertility, structure, and moisture retention. Humus also provides essential nutrients to plants and promotes the growth of beneficial soil organisms. Therefore, it is correct to say that the O-horizon is rich in humus.

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3.

The largest soil particle is clay.
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The given statement is false. Clay is actually the smallest soil particle, with a particle size less than 0.002 mm. The largest soil particle is sand, with a particle size ranging from 0.05 to 2 mm. Therefore, the correct answer is false.

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4.

Topsoil is rich in ____________, therefore it is dark in colour.
- A.
  
  Humus
- B.
  
  Minerals
- C.
  
  Parent rock
- D.
  
  Fertilizers
Correct Answer
A. Humus

Explanation
Topsoil is rich in humus, which is a dark organic material formed from the decomposition of plant and animal matter. Humus is responsible for the dark color of topsoil. It contains a high concentration of nutrients and helps retain moisture, making it ideal for plant growth. Additionally, humus improves soil structure, aeration, and nutrient-holding capacity, making it an essential component of fertile soil.

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5.

The amount of pores that soil has is called porosity.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Porosity refers to the measure of empty spaces or voids in a material, such as soil. These voids are typically filled with air or water. Therefore, the statement that the amount of pores that soil has is called porosity is true. The porosity of soil is an important characteristic as it affects its ability to hold and transmit water, nutrients, and air, which in turn influences plant growth and soil fertility.

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6.

Which of the following is the largest soil particle?
- A.
  
  Pebbles
- B.
  
  Clay
- C.
  
  Humus
- D.
  
  Water
Correct Answer
A. Pebbles

Explanation
Pebbles are the largest soil particles compared to clay, humus, and water. Pebbles are typically larger than 2 millimeters in diameter and are classified as coarse soil particles. Clay, on the other hand, is the smallest soil particle, measuring less than 0.002 millimeters in diameter. Humus refers to the organic matter in soil, while water is not considered a soil particle but rather a component of soil moisture.

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7.

A vertical section of soil from the ground surface to the parent rock that shows the different layers of soil is called _____________.
- A.
  
  Composition of soil
- B.
  
  Soil profile
- C.
  
  Topsoil
- D.
  
  Bedrock
Correct Answer
B. Soil profile

Explanation
A soil profile is a vertical section of soil from the ground surface to the parent rock that displays the various layers or horizons of soil. It provides a detailed representation of the composition, texture, and structure of the soil, allowing for a better understanding of the soil's properties and characteristics. The term "composition of soil" refers to the makeup of the soil in terms of its components, such as minerals, organic matter, water, and air. "Topsoil" refers to the uppermost layer of soil, while "bedrock" refers to the solid rock underlying the soil.

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1
8.

The subsoil is rich in minerals that seep down along with water.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The Earth's crust's top layer comprises soil, consisting of minerals, decomposed plant and animal matter. A layer running parallel to the soil surface is termed a soil horizon.

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2
1
9.

Topsoil is the uppermost layer of soil.
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
The statement "Topsoil is the uppermost layer of soil" is true. Topsoil refers to the uppermost layer of soil, typically ranging from 2 to 8 inches in depth. It is rich in organic matter, nutrients, and microorganisms, making it vital for plant growth. Topsoil is where most of the plant roots are located, and it plays a crucial role in supporting agriculture and natural ecosystems.

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10.

______________ is the lowermost layer and mainly consists of the parent rock.
- A.
  
  Topsoil
- B.
  
  Subsoil
- C.
  
  Bedrock
- D.
  
  Sand
Correct Answer
C. Bedrock

Explanation
The lowermost layer, known as bedrock, is primarily composed of the parent rock. This layer is located beneath the subsoil and topsoil layers and forms the solid foundation of the earth's surface. Bedrock is typically made up of solid rock or consolidated material and plays a crucial role in supporting the layers above it.

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Current Version
Oct 04, 2024

Quiz Edited by
ProProfs Editorial Team
May 10, 2020

Quiz Created by
Amtul Fatir

The Layers Of Soil Quiz! Trivia

Soil profile consists of four distinct soil layers. These layers are also referred to as _______________.

O-horizon that just lies above the topsoil is rich in _______________.

The largest soil particle is clay.

Topsoil is rich in ____________, therefore it is dark in colour.

The amount of pores that soil has is called porosity.

Which of the following is the largest soil particle?

A vertical section of soil from the ground surface to the parent rock that shows the different layers of soil is called _____________.

The subsoil is rich in minerals that seep down along with water.

Topsoil is the uppermost layer of soil.

______________ is the lowermost layer and mainly consists of the parent rock.