Environmental Studies ยท Biology

Soil Science and Fertilizers

1,537 Questions

Soil science focuses on soil formation, classification, and fertility management using fertilizers and organic amendments. Agricultural and environmental science exams heavily feature questions on biofertilizers, mycorrhiza, and phytoremediation. Practice these questions to build a strong understanding of soil nutrient cycles.

Phytoremediation techniquesOrganic soil amendmentsBiofertilizers and mycorrhizaNitrous oxide emissionsIn-situ soil remediationGreen manuring effects

Soil Science and Fertilizers Questions

Multiple choice

Which soil testing method is commonly used to determine soil acidity?

  1. Electrical Conductivity

  2. Cation Exchange Capacity

  3. pH Measurement

  4. Particle Size Analysis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

pH measurement is the standard method used to determine soil acidity.

Multiple choice

What is the primary source of acidity in soils derived from volcanic rocks?

  1. Organic Matter Decomposition

  2. Industrial Emissions

  3. Natural Weathering

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

Soils derived from volcanic rocks can have high levels of acidity due to the presence of sulfuric acid.

Multiple choice

Which of the following factors influences the amount of nitrous oxide (N2O) emitted from dams and irrigation projects?

  1. Soil moisture content

  2. Temperature of the soil

  3. Amount of organic matter in the soil

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

The amount of nitrous oxide (N2O) emitted from dams and irrigation projects is influenced by the soil moisture content, the temperature of the soil, and the amount of organic matter in the soil.

Multiple choice

Which of the following factors is NOT likely to influence the amount of nitrous oxide (N2O) emitted from dams and irrigation projects?

  1. Soil moisture content

  2. Temperature of the soil

  3. Amount of organic matter in the soil

  4. pH of the soil
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The pH of the soil is not likely to influence the amount of nitrous oxide (N2O) emitted from dams and irrigation projects.

Multiple choice

Which of the following is a common biodynamic preparation?

  1. Horn manure

  2. Compost tea

  3. Chemical fertilizer

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

Horn manure is a biodynamic preparation made by burying cow manure in a cow horn and then burying the horn in the soil. It is used to stimulate soil fertility and plant growth.

Multiple choice

How does the high temperature in deserts affect soil formation?

  1. It accelerates the decomposition of organic matter.

  2. It promotes the formation of clay minerals.

  3. It leads to the accumulation of salts in the soil.

  4. It enhances the leaching of nutrients from the soil.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

High temperatures in deserts accelerate the decomposition of organic matter, leading to low organic matter content in desert soils.

Multiple choice

How does the lack of water in deserts affect soil formation?

  1. It promotes the formation of clay minerals.

  2. It enhances the leaching of nutrients from the soil.

  3. It leads to the accumulation of organic matter in the soil.

  4. It inhibits the decomposition of organic matter.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The lack of water in deserts inhibits the decomposition of organic matter, leading to its accumulation in the soil.

Multiple choice

What is the primary source of nutrients for plants in desert soils?

  1. Atmospheric deposition

  2. Decomposition of organic matter

  3. Weathering of rocks

  4. Fertilizers applied by humans
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Atmospheric deposition, such as dust and rain, is the primary source of nutrients for plants in desert soils.

Multiple choice

How does the high pH of desert soils affect plant growth?

  1. It promotes the availability of nutrients to plants.

  2. It inhibits the growth of beneficial soil microorganisms.

  3. It enhances the leaching of nutrients from the soil.

  4. It reduces the water-holding capacity of the soil.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The high pH of desert soils can inhibit the growth of beneficial soil microorganisms, affecting nutrient cycling and plant growth.

Multiple choice

How does the low organic matter content of desert soils affect soil fertility?

  1. It enhances the availability of nutrients to plants.

  2. It promotes the growth of beneficial soil microorganisms.

  3. It reduces the water-holding capacity of the soil.

  4. It decreases the soil's ability to retain nutrients.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The low organic matter content of desert soils decreases the soil's ability to retain nutrients, making them less fertile.

Multiple choice

What is the term used to describe the practice of using organic matter, such as compost or manure, to improve soil health and fertility?

  1. Composting.

  2. Mulching.

  3. Crop rotation.

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

Composting is the process of breaking down organic matter, such as food scraps, yard waste, and manure, into a nutrient-rich soil amendment. It helps to improve soil health, fertility, and water retention.

Multiple choice

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

  1. Compost

  2. Manure

  3. Fertilizer

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

Pesticides are not soil amendments, but rather chemicals used to control pests.

Multiple choice

How does solid waste pollution from irrigation projects impact soil quality?

  1. It can contaminate soil with heavy metals and other pollutants.

  2. It can reduce soil fertility.

  3. It can disrupt soil structure.

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

Solid waste pollution from irrigation projects can contaminate soil with heavy metals and other pollutants, reduce soil fertility, and disrupt soil structure.

Multiple choice

What is the primary source of soil organic matter?

  1. Plant residues

  2. Animal manure

  3. Microorganisms

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

Soil organic matter is derived from a variety of sources, including plant residues, animal manure, and microorganisms.

Multiple choice

Which of the following is not a component of humus?

  1. Humic acids

  2. Fulvic acids

  3. Lignin

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

Humus is composed of humic acids, fulvic acids, and lignin. Clay minerals are not a component of humus.