PLS 366 EXAM 1 QUESTIONS & ANSWERS
Nitrate (NO3-) - Answers -When the soil becomes waterlogged oxygen levels begin to
drop and reducing conditions become established. Under these conditions, THIS
terminal electron acceptor is the next one used by anaerobic microorganism leading to
conversion and potential loss of this vital plant macronutrient.
- Purifies water supplies consistently
- serves as a habitat for diverse organisms
- provides a growth medium for plants
- recycles nutrients and waste materials - Answers -Key Functions of soils in an
ecosystem context include:
E - Answers -This soil horizon would often show evidence of downward movement,
otherwise known as eluviation, of organic materials:
46.8 - Answers -the bulk density of a soil was 1.41 grams/cm3, while its particle density
was 2.65 grams/cm3. its total porosity, expressed as a percentage, would be:
1.24 - Answers -A wet soil sample weighed 320.2 grams; once it had been dried at 105
C for 72 hours, its dry weight was 243.8 grams. it was taken from the soil using a or be
with a sampling cylinder size of 196.5 cm3. In grams/cm3, what was the bulk density of
this soil sample?
Translocation - Answers -Already degraded organic matter moving with soil water from
upper horizons to be deposited in the horizon below would be an example of which of
the soil profile developmental processes?
Oa - Answers -This subordinate horizon distinction would be given by a soil scientists
to an "O" horizon that was composed of highly decomposed organic material
Ap - Answers -A soil horizon with an obvious HUMAN impact is:
Aquic - Answers -A soil with a very high annual moisture content sufficient enough to
be devoid of gaseous oxygen for significant periods of the year would be designated
with the ________ moisture regime class
5 - Answers -Soils are comprised of air, water, mineral, and organic matter. In ordinary
soils with temperatures above freezing, what will be the percentage of organic matter?
climate and vegetation - Answers -Which of the soil forming factor pairs below would
have the greatest influence on soils development?
Colluvium - Answers -Gravity is the PRIAMRY force involved in the movement of this
type of transported parent material:
, Iowa Soils - Answers -You have gone to the Ecuadorian rainforest, the coast of the
Bahamas and central plains of Iowa to collect some soils for an experiment you are
planning to do.
You need to determine some basic properties of the soils before you get started. Before
actually measuring it, which soil would you predict to have the highest base saturation
(%BS)
Bt - Answers -This subsoil horizon contains substantial amounts of illuviated clays:
In transects, avoiding obvious discontinues - Answers -The best overall approach to
sampling a soil in a given landscape (to minimize cost while maximizing data quality)
would be to take the samples:
Clay - Answers -As the percentage of this soil textural component increases, soil
aeration declines to the greatest extent:
-Sandy soils compared with clayey soils
-forest soils versus agricultural soils
-soils with many earthworms versus soils with few earthworms - Answers -Macropores
are MORE frequent in which of the following situations:
Structureless-single-grained - Answers -This soil structure would most commonly be
found in sandy soils:
Udepts - Answers -Given the taxonomic name for Hazleton, the Pennsylvania state
soil, what is the suborder? Taxonomic name: Loamy-skeletal, siliceous, active, mesic
Typic Dystrudepts
Gelisols and Aridisols - Answers -This pair of soil orders differs from one another
primarily because of CLIMATE:
Oxisols and Aridisols - Answers -This pair of soil orders differs from one another
primarily because of VEGETATION:
Entisols and Utisols - Answers -This pair of soil orders differs from one another
primarily because of TIME:
Color, Structure and texture - Answers -The three most important soil properties used
to characterize a soil profile and which appear in a soil series description are:
Plant roots and fungal hyphae holding particles together - Answers -The best example
of a BIOLOGICAL process which influences soil aggregate formation would be:
Nitrate (NO3-) - Answers -When the soil becomes waterlogged oxygen levels begin to
drop and reducing conditions become established. Under these conditions, THIS
terminal electron acceptor is the next one used by anaerobic microorganism leading to
conversion and potential loss of this vital plant macronutrient.
- Purifies water supplies consistently
- serves as a habitat for diverse organisms
- provides a growth medium for plants
- recycles nutrients and waste materials - Answers -Key Functions of soils in an
ecosystem context include:
E - Answers -This soil horizon would often show evidence of downward movement,
otherwise known as eluviation, of organic materials:
46.8 - Answers -the bulk density of a soil was 1.41 grams/cm3, while its particle density
was 2.65 grams/cm3. its total porosity, expressed as a percentage, would be:
1.24 - Answers -A wet soil sample weighed 320.2 grams; once it had been dried at 105
C for 72 hours, its dry weight was 243.8 grams. it was taken from the soil using a or be
with a sampling cylinder size of 196.5 cm3. In grams/cm3, what was the bulk density of
this soil sample?
Translocation - Answers -Already degraded organic matter moving with soil water from
upper horizons to be deposited in the horizon below would be an example of which of
the soil profile developmental processes?
Oa - Answers -This subordinate horizon distinction would be given by a soil scientists
to an "O" horizon that was composed of highly decomposed organic material
Ap - Answers -A soil horizon with an obvious HUMAN impact is:
Aquic - Answers -A soil with a very high annual moisture content sufficient enough to
be devoid of gaseous oxygen for significant periods of the year would be designated
with the ________ moisture regime class
5 - Answers -Soils are comprised of air, water, mineral, and organic matter. In ordinary
soils with temperatures above freezing, what will be the percentage of organic matter?
climate and vegetation - Answers -Which of the soil forming factor pairs below would
have the greatest influence on soils development?
Colluvium - Answers -Gravity is the PRIAMRY force involved in the movement of this
type of transported parent material:
, Iowa Soils - Answers -You have gone to the Ecuadorian rainforest, the coast of the
Bahamas and central plains of Iowa to collect some soils for an experiment you are
planning to do.
You need to determine some basic properties of the soils before you get started. Before
actually measuring it, which soil would you predict to have the highest base saturation
(%BS)
Bt - Answers -This subsoil horizon contains substantial amounts of illuviated clays:
In transects, avoiding obvious discontinues - Answers -The best overall approach to
sampling a soil in a given landscape (to minimize cost while maximizing data quality)
would be to take the samples:
Clay - Answers -As the percentage of this soil textural component increases, soil
aeration declines to the greatest extent:
-Sandy soils compared with clayey soils
-forest soils versus agricultural soils
-soils with many earthworms versus soils with few earthworms - Answers -Macropores
are MORE frequent in which of the following situations:
Structureless-single-grained - Answers -This soil structure would most commonly be
found in sandy soils:
Udepts - Answers -Given the taxonomic name for Hazleton, the Pennsylvania state
soil, what is the suborder? Taxonomic name: Loamy-skeletal, siliceous, active, mesic
Typic Dystrudepts
Gelisols and Aridisols - Answers -This pair of soil orders differs from one another
primarily because of CLIMATE:
Oxisols and Aridisols - Answers -This pair of soil orders differs from one another
primarily because of VEGETATION:
Entisols and Utisols - Answers -This pair of soil orders differs from one another
primarily because of TIME:
Color, Structure and texture - Answers -The three most important soil properties used
to characterize a soil profile and which appear in a soil series description are:
Plant roots and fungal hyphae holding particles together - Answers -The best example
of a BIOLOGICAL process which influences soil aggregate formation would be:
