Mixed Questions (Supplemental Reviewer) — Soil Science Reviewer Questions
300 board-style Mixed Questions (Supplemental Reviewer) items for the Agriculturist Licensure Examination, free and open to every examinee. Texture drives water, water drives aeration, and aeration drives nutrient availability. Reason down that chain and most items unlock.
300 built-in questions in this topic · approved additions may publish live · part of Soil Science
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Sample Mixed Questions (Supplemental Reviewer) questions with answers and explanations
Board-style items taken from the Soil Science bank. Every answer is explained, which is the part that makes a review question worth doing twice.
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Which description best defines soil in modern soil science?
- A. A mixture of fertilizer nutrients and decomposed plant residues spread over the land surface each season
- B. Any unconsolidated material lying above bedrock, regardless of biological activity or of the processes that produced it
- C. A dynamic natural body of mineral and organic constituents, water, air, and organisms that develops at Earth’s surface and supports multiple functions correct
- D. A loose layer composed only of weathered mineral particles, with no water, air, or living organisms present
Why: Soil is a dynamic natural body formed through interacting physical, chemical, and biological processes; it is more than weathered rock alone.
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What is a pedon?
- A. The smallest three-dimensional body of soil that can represent the nature and arrangement of its horizons correct
- B. A group of similar soil series occurring within a province
- C. The mineral portion of a surface horizon
- D. The vertical face exposed in a soil pit
Why: A pedon is the basic three-dimensional sampling/classification unit used to represent a soil.
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What does the term polypedon denote?
- A. A single horizon having both eluvial and illuvial properties
- B. A contiguous group of similar pedons that constitutes a soil individual in the landscape correct
- C. A soil profile that contains more than one parent material
- D. A laboratory composite made from multiple soil samples
Why: A polypedon is an assemblage of contiguous, similar pedons and is treated as a soil individual.
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Which branch of soil science emphasizes soil genesis, morphology, and classification as a natural body?
- A. Petrology
- B. Edaphology
- C. Pedology correct
- D. Agronomy
Why: Pedology studies soils as natural bodies, including their formation, morphology, and classification.
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Which approach to soil science focuses primarily on how soil properties influence plant growth and land use?
- A. Edaphology correct
- B. Mineralogy
- C. Geomorphology
- D. Pedology
Why: Edaphology emphasizes soil in relation to living organisms, especially plants and practical land use.
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What are the three physical phases commonly recognized in soil?
- A. Mineral, organic, and biological
- B. Air, humus, and roots
- C. Sand, silt, and clay
- D. Solid, liquid, and gas correct
Why: Soil is commonly described as a three-phase system consisting of solids, soil solution, and soil air.
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Which soil component includes sand, silt, clay, and rock-derived minerals?
- A. Soil atmosphere
- B. Soil solution
- C. Soil organic matter
- D. Mineral matter correct
Why: Mineral matter is the inorganic solid fraction produced largely from rocks and minerals.
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What does soil organic matter include?
- A. Only microorganisms living in the rhizosphere
- B. Only stable humus that no longer decomposes
- C. Living and dead organic materials and their decomposition products in soil correct
- D. Only fresh crop residues on the soil surface
Why: Soil organic matter encompasses organic materials at different stages of decomposition, including living biomass and residues.
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