SCSC-301 Exam 1 with verified answers
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
fine textured soils is to provide an increase in: - ANSWERS✔✔ macro porosity
The purity of light reflected by a soil is called: - ANSWERS✔✔ chroma
A word used to describe the consistence of soil is: - ANSWERS✔✔ firm
In a soil, having a color of 10YR 4/1, the hue is: - ANSWERS✔✔ 10YR
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 iron
Considering a soil as a medium for plant growth in terms of aeration, water supply,
and temperature, the most desirable structural type is: - ANSWERS✔✔ granular
Under normal aerated conditions, soil air compared to the atmospheric air almost
always contains a significantly higher percentage of: - ANSWERS✔✔ CO2
The soil components- air, solution, solids - arranged in order of increasing heat
conductance (lowest heat conductance first) are: - ANSWERS✔✔ air, solution, solids
In a clay loam soil horizon having a strongly developed fine, granular structure, the
soil aeration is likely to be: - ANSWERS✔✔ good
, Daily fluctuations in temperature at 2cm below the soil surface, when compared to
daily fluctuations at 15cm below the soil surface: - ANSWERS✔✔ are of greater
magnitude
The subsoil in College Station, Texas is cooler than either the surface soil or the
parent material: - ANSWERS✔✔ in the spring
Water in soil is: - ANSWERS✔✔ a transporting medium
The amount of heat stored in the soil in the fall at a given location is primarily a
function of soil: - ANSWERS✔✔ moisture
Water which drains downward in a soil consists of water which moves in response to
differences in: - ANSWERS✔✔ matric and gravitational potentials
Available water in soils is water held between the wilting coefficient and: -
ANSWERS✔✔ field capacity
In a soil layer containing large holes or channels open at the surface, water enters
the large holes: - ANSWERS✔✔ when the water reaches it
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✔✔ hematite
A typical moist surface soil contains approximately 25% by volume is: -
ANSWERS✔✔ air
One of the most soluble and therefore, easily weather minerals is: - ANSWERS✔✔
gypsum
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
fine textured soils is to provide an increase in: - ANSWERS✔✔ macro porosity
The purity of light reflected by a soil is called: - ANSWERS✔✔ chroma
A word used to describe the consistence of soil is: - ANSWERS✔✔ firm
In a soil, having a color of 10YR 4/1, the hue is: - ANSWERS✔✔ 10YR
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 iron
Considering a soil as a medium for plant growth in terms of aeration, water supply,
and temperature, the most desirable structural type is: - ANSWERS✔✔ granular
Under normal aerated conditions, soil air compared to the atmospheric air almost
always contains a significantly higher percentage of: - ANSWERS✔✔ CO2
The soil components- air, solution, solids - arranged in order of increasing heat
conductance (lowest heat conductance first) are: - ANSWERS✔✔ air, solution, solids
In a clay loam soil horizon having a strongly developed fine, granular structure, the
soil aeration is likely to be: - ANSWERS✔✔ good
, Daily fluctuations in temperature at 2cm below the soil surface, when compared to
daily fluctuations at 15cm below the soil surface: - ANSWERS✔✔ are of greater
magnitude
The subsoil in College Station, Texas is cooler than either the surface soil or the
parent material: - ANSWERS✔✔ in the spring
Water in soil is: - ANSWERS✔✔ a transporting medium
The amount of heat stored in the soil in the fall at a given location is primarily a
function of soil: - ANSWERS✔✔ moisture
Water which drains downward in a soil consists of water which moves in response to
differences in: - ANSWERS✔✔ matric and gravitational potentials
Available water in soils is water held between the wilting coefficient and: -
ANSWERS✔✔ field capacity
In a soil layer containing large holes or channels open at the surface, water enters
the large holes: - ANSWERS✔✔ when the water reaches it
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✔✔ hematite
A typical moist surface soil contains approximately 25% by volume is: -
ANSWERS✔✔ air
One of the most soluble and therefore, easily weather minerals is: - ANSWERS✔✔
gypsum
