TAMU SCSC 301 Final Exam Questions with Complete Solutions
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TAMU SCSC 301
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TAMU SCSC 301
TAMU SCSC 301 Final Exam Questions with Complete Solutions
After a growing season of heavy tillage traffic across a soil, a soil property that is least affected is: - Answer-Particle density
/.From a biological point of view, the most important role of structural development in clayey texture...
TAMU SCSC 301 Final Exam Questions
with Complete Solutions
After a growing season of heavy tillage traffic across a soil, a soil property that is least
affected is: - 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: - Answer-macro porosity
/.The purity of light reflected by a soil is called: - Answer-chroma
/.A word used to describe the consistence of a soil is: - Answer-plastic
/.A soil horizon in which the supply of gases is adequate for optimum biological activity
is said to: - Answer-be well aerated
/.In a soil, having a color of 10YR 4/1, the value is: - Answer-4
10Y - hue
1 - chroma
/.At a given pressure gradient, diffusion is a function of: - Answer-total air porosity
/.A principal role of oxygen is soils is: - Answer-oxidation of iron
/.Considering a soil as a medium for plant growth in terms of aeration, water supply, and
temperature, the most desirable structural type is: - Answer-granular
/.Under normal aerated conditions, soil air compared to the atmospheric air almost
always contains the same percentage of: - Answer-N2
/.The soil components - solids, solution, air - arranged in order of decreasing heat
capacity (highest capacity first) are: - Answer-solution, solids, air
/.In a clay loam soil horizon having a strongly developed fine, granular structure, the soil
aeration is likely to be: - Answer-good
/.Daily fluctuations in temperature at 15cm below the soil surface, when compared to
daily fluctuations at 2cm below the soil surface: - Answer-occur later in the day
/.The subsoil is cooler than either the surface soil or parent material: - Answer-in early
spring
/.Water in the soil is: - Answer-a good heat sink
, /.The rate of soil warming in the spring at a given location is primarily a function of soil: -
Answer-moisture
/.Water which drains downward in a soil consists of water which moves in response to
differences in: - Answer-matric and gravitational potentials
/.Available water in soils is water held between the wilting coefficient and: - Answer-field
capacity
/.In a soil layer containing large holes or channels open at the surface, water enters the
large holes: - Answer-by gravity flow only
/.Water enters a very clayey subsoil from a sandy surface soil: - Answer-as soon as the
wetting front reaches it
/.A common primary silicate mineral which weathers to form secondary silicate minerals
in soils is: - Answer-horneblend
/.A typical moist surface soil contains approximately 1 to 5% by volume of
____________. - Answer-organic matter
/.One of the more soluble and therefore, easily weathered minerals in acid soils is: -
Answer-calcite
/.A primary iron mineral that is resistant to weathering is: - Answer-hematite
/.Primary silicate mineral resistant to weathering and dominates sand/silt of most soils
is: - Answer-quartz
/.The properties of soil are due to the combined effects of __________________, as
modified by relief, acting on parent material over time. - Answer-climate and biota
/.A property used in distinguishing among minerals in hand specimen is: - Answer-color
/.The two dimensional depiction of soil in a soil pit is commonly referred to as a soil: -
Answer-profile
/.Soils which support aerobic growth must contain: - Answer-gaseous oxygen
/.A passive soil forming factor is: - Answer-parent material
(and time)
/.In the following question, list the appropriate letter for each part of the question in the
order of occurrence in the statement.
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