TAMU SCSC 301 Final Exam 2024/2025
Latest Exam Accurate Fall/Spring Term
Score A (Answered)
At a given pressure gradient, diffusion is a function of:
total air porosity
A principal role of oxygen is soils is:
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:
granular
After a growing season of heavy tillage traffic across a soil, a soil property that is least
affected is:
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:
macro porosity
,The purity of light reflected by a soil is called:
chroma
A word used to describe the consistence of a soil is:
plastic
A soil horizon in which the supply of gases is adequate for optimum biological activity
is said to:
be well aerated
In a soil, having a color of 10YR 4/1, the value is:
4
10Y - hue
1 - chroma
Under normal aerated conditions, soil air compared to the atmospheric air almost
always contains the same percentage of:
N2
,The soil components - solids, solution, air - arranged in order of decreasing heat
capacity (highest capacity first) are:
solution, solids, air
In a clay loam soil horizon having a strongly developed fine, granular structure, the
soil aeration is likely to be:
good
Daily fluctuations in temperature at 15cm below the soil surface, when compared to
daily fluctuations at 2cm below the soil surface:
occur later in the day
The subsoil is cooler than either the surface soil or parent material:
in early spring
Water in the soil is:
a good heat sink
, The rate of soil warming in the spring at a given location is primarily a function of soil:
moisture
Water which drains downward in a soil consists of water which moves in response to
differences in:
matric and gravitational potentials
Available water in soils is water held between the wilting coefficient and:
field capacity
In a soil layer containing large holes or channels open at the surface, water enters the
large holes:
by gravity flow only
Water enters a very clayey subsoil from a sandy surface soil:
as soon as the wetting front reaches it
A common primary silicate mineral which weathers to form secondary silicate
minerals in soils is:
horneblend
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