30 Questions
What are the essential elements needed in large quantities for plant growth?
Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus, Potassium, Calcium, Magnesium, Sulfur
What is the vertical section through soil called?
Soil Profile
Which layer of the soil profile is known as 'topsoil'?
A horizon
What accelerates the loss of soil through wind or water action?
Erosion
What is the parent material for most soils?
Rock
What is a mixture of minerals, organic matter, liquids, and gases known as?
Soil
What portion of soil includes animal and plant residues rich in carbon compounds?
Organic Matter
What is the primary role of soil organisms like earthworms, fungi, and arthropods?
All of the above
What determines the texture of soil?
The particle sizes of sand, silt, and clay
Which of the following statements about soil pore space is correct?
Pore space can be occupied by either air or water
What is the ideal soil texture for plant growth?
Loam soils
Which of the following forces is responsible for the adhesion of water to soil particles?
Adhesive force
What is the approximate size range for sand particles in soil?
0.05 - 2.0 mm
Which of the following forces is responsible for the attraction between water molecules themselves?
Cohesive force
What is the primary factor that determines the carbon-nitrogen ratio in soil?
The amount of organic matter
What is the primary function of soil aggregation and structure?
To improve water storage capacity
How do soil organisms like earthworms, fungi, and arthropods contribute to soil health?
They break down organic matter and release nutrients
What is the primary function of the cohesion force between water molecules in soil?
To facilitate the movement of water through the soil
Which soil texture is considered the most ideal for plant growth?
Loam soil
What is the primary role of the carbon-nitrogen (C:N) ratio in soil?
To control the rate of organic matter decomposition
What is the primary function of soil pore space?
All of the above
What is the primary source of organic matter in soil?
Decomposed plant and animal residues
What is the approximate size range for silt particles in soil?
0.002 - 0.05 mm
Which of the following is NOT a primary type of rock that serves as parent material for soils?
Biogenic
Which of the following is NOT a macronutrient required by plants in large quantities?
Sodium
What is the primary function of organic matter in soil?
Sequestering and supplying nutrients
Which of the following statements about soil texture is correct?
Soil texture refers to the size and shape of soil particles.
Which of the following micronutrients is NOT required by plants?
Lithium
What is the primary factor that determines the carbon-nitrogen ratio in soil?
Organic matter content
Which of the following statements about soil erosion is correct?
Soil erosion is accelerated by wind or water action.
Explore the key concepts related to soil in Chapter 12, highlighting the differences between soil and dirt. Learn about the essential properties of soil that affect plant growth, soil fertility, erosion, and more.
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