SCSC 301
Texas A&M University
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SCSC 301 Exam Questions And Answers With Complete Solutions
- Exam (elaborations) • 15 pages • 2023
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Which horizon is not part of the soil solum? correct answer: C 
 
Organic matter in soil typically accounts for ____% or less of the soils total volume. correct answer: 5% 
 
Pore space in soil may contain either _____ or _____ correct answer: Air 
Water 
 
Soils are the result of ______ and biota acting on parent material over time as modified by ______ correct answer: Climate 
Topography 
 
Though plants depend on soil for growth, which of the items below is found in soil, but not required...
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SCSC 301 Final Howe Questions With Complete Solutions
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When organic-N is converted into ammonia or ammonium, the process is called? correct answer: Ammonification 
 
During nitrification, ______ is converted to ______ correct answer: Ammonium; Nitrate 
 
Which soil minerals are likely to trap, or fix, NH4+ and K+ in their interlayer making them relatively unavailable to plants? correct answer: Vermiculite and mica 
 
Which answer best describes denitrification? correct answer: Conversion of nitrate to gaseous N (e.g., NO, N2O, N2) under low/no o...
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SCSC 301 Exam #1 Questions With Complete Solutions
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Loess correct answer: Silt to very fine sand. Deposited by the wind. 
 
Volcanic ash correct answer: Soils of very low bulk density and high fixation of phosphorus. 
 
Glacial till correct answer: Poorly sorted. 
 
Glacial wash correct answer: Well sorted. 
 
Texture correct answer: The size distribution of inorganic (mineral) primary particles. 
 
Silt correct answer: .05-.002 mm in diameter 
 
USDA correct answer: Who is our final say on particle diameter of soils? 
 
Permeability corre...
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SCSC 301 Exam 1 TAMU Questions With Complete Solutions
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Plants obtain from soil: correct answer: - Physical support 
- Air 
- Water 
- Temperature regulation 
- Protection 
- Nutrient elements (17 essential elements) 
 
Root respiration correct answer: - Produce CO2 
- Release O2 
(ventilation in soil pores) 
 
Macronutrients (8) correct answer: - Calcium (Ca) 
- Magnesium (Mg) 
- Nitrogen (N) 
- Potassium (K) 
- Phosphorous (P) 
- Carbon (C) 
- Hydrogen (H) 
- Oxygen (O) 
- Sulfur (S) 
 
Micronutrients (8) correct answer: - Copper (Cu) 
- Iron...
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SCSC 301 exams 1,2,3,4 Questions With Complete Solutions
- Exam (elaborations) • 46 pages • 2023
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A soil with 25% _____ and 25% ______by volume is close to ideal 
-water; organic matter 
-Air; mineral matter 
-Air; water 
-Mineral matter; organic matter correct answer: Air; water 
 
Soil is a dynamic natural body having properties due to the combined effects of _______ and biota as modified by ________ acting on parent material over time. 
-climate; topography 
-Time; Weather 
-Topography; parent material 
-Biota; climate 
-Weather; topography correct answer: climate; topography 
 
A soil ...
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SCSC-301 : Exam 1 Questions With Complete Solutions
- Exam (elaborations) • 9 pages • 2023
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After a growing season of heavy tillage traffic across a soil, a soil property that is affected is: correct answer: bulk density 
 
From a biological point of view, the most important role of structural development in fine textured soils is to provide an increase in: correct answer: macro porosity 
 
The purity of light reflected by a soil is called: correct answer: chroma 
 
A word used to describe the consistence of soil is: correct answer: firm 
 
In a soil, having a color of 10YR 4/1, th...
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TAMU SCSC 301 Final Questions With Complete Solutions
- Exam (elaborations) • 20 pages • 2023
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After a growing season of heavy tillage traffic across a soil, a soil property that is least affected is: correct answer: Particle density 
 
From a biological point of view, the most important role of structural development in clayey textured soils is to provide an increase in: correct answer: macro porosity 
 
The purity of light reflected by a soil is called: correct answer: chroma 
 
A word used to describe the consistence of a soil is: correct answer: plastic 
 
A soil horizon in which ...
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SCSC 301 Exam IV TAMU Dr. Feagley Questions With Complete Solutions
- Exam (elaborations) • 25 pages • 2023
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A soil with a pH of 8.0, 10% exchangeable sodium, and 5 dS/m conductivity is: 
 
-saline, non-sodic 
-non-saline, non-sodic 
-non-calcareous 
-saline, sodic 
-non-saline, sodic correct answer: saline, non-sodic 
 
The most economical means of decreasing the soil pH from 7.0 to 4.5 in a non-calcareous soil is by the addition of: 
 
-neutral salts 
-gypsum 
-ferrous sulfate 
-nitrogen fertilizer 
-agricultural limestone correct answer: ferrous sulfate 
 
With the passage of time, the soil pH t...
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