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SCSC 301 Final Exam with correct answers
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SCSC 301 Final Exam with correct answers
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SCSC 301 Final Exam with correctanswers
A soil has a bulk density of 1.3 g/cm^3, a particle density of 2.6g/cm^3, a total
porosity of .5 and a gravimetric water content of 0.2. Calculate the water-filled
porosity. - ANSWERS✔✔ .26
After a growing season of heavy tillage traffic across a soil, a soil property that is
affected is: - ANSWERS✔✔ bulk density
From a biological point of view, the most important role of structural development in
clayey textured soils is to provide an increase in: - ANSWERS✔✔ macro porosity
The quantity of light reflected by a soil is called: - ANSWERS✔✔ value
A word used to describe the consistence of a soil is: - ANSWERS✔✔ friable
Calculate the mass of one hectare of soil in kg to 15 cm depth. - ANSWERS✔✔
2,250,038
In a soil having a color of 10YR 4/1, the chroma is: - ANSWERS✔✔ 1
At a given partial pressure gradient, diffusion is a function of: - ANSWERS✔✔ air-
filled porosity
A principal role of oxygen in soils is: - ANSWERS✔✔ oxidation of organic matter
Considering a soil as a medium for plant growth in terms of aeration, water supply,
and temp, the most desirable structural type is: - ANSWERS✔✔ granular
,Under normal aerated conditions, soil air compared to the atmospheric air is almost
always contains the same percentage of: - ANSWERS✔✔ N2
The soil components--air, solution, solids--arranged in order of increasing heat
capacity (lowest heat capacity first) are: - ANSWERS✔✔ air, solids, solution
In a clay loam soil horizon having a fine, platy structure, the soil aeration is likely to
be: - ANSWERS✔✔ poor
Daily fluctuations in temp at 15 cm below the soil surface, when compared to daily
fluctuations at the soil surface: - ANSWERS✔✔ occur later in the day
The subsoil in College Station is cooler than either the surface soil or the parent
material: - ANSWERS✔✔ in early spring
Water in soil is: - ANSWERS✔✔ a transporting medium
The amount of heat stored in the soil in the spring at a given location is primarily a
function of soil: - ANSWERS✔✔ moisture
Water which moves in all directions in a soil consists of water which moves in
response to difference in: - ANSWERS✔✔ matric potential only
Available water in soils is water held between field capacity and: - ANSWERS✔✔
wilting coefficient
In a soil layer containing large holes or channels closed at the surface, water enters
the large holes: - ANSWERS✔✔ only after the surrounding soil is saturated
Water enters a very sandy subsoil from a clayey surface soil: - ANSWERS✔✔ only
after the clayey soil is saturated
A common primary silicate mineral which weathers to form secondary silicate
minerals in soils is: - ANSWERS✔✔ feldspars
, A typical moist surface soil contains approximately 25% by volume ___________. -
ANSWERS✔✔ water
One of the most soluble and therefore, easily weather minerals is: - ANSWERS✔✔
sylvite
A primary silicate mineral that does not weather to other silicate minerals is: -
ANSWERS✔✔ quartz
The properties of soil are mainly due to the combine effects of __________ acting on
parent material over time/ - ANSWERS✔✔ climate and biota
A property used in distinguishing among minerals in hand-held specimens is: -
ANSWERS✔✔ luster
The soil horizons that the soil solum consist of are: - ANSWERS✔✔ O, A, E, B
Soils which support aerobic plant growth must contain: - ANSWERS✔✔ gaseous
oxygen
The passive soil forming factor is: - ANSWERS✔✔ parent material
Surface soils are (more, same, less) porous; (more, same, less) dense and
commonly of (coarser, finer) texture than subsoils. - ANSWERS✔✔ More; less;
coarser
A soil typically contains a higher percentage of ___________ than a rock which the soil
is derived from. - ANSWERS✔✔ iron
The four most abundant metallic elements in most soils and rocks that are essential
for all plants are: - ANSWERS✔✔ Ca, Mg, K, Fe
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