Question 1

The process of aerobic respiration is a significant source of which of the following gases?

Accepted Answer

A) methane 
B) oxygen 
C) nitrogen 
D) carbon dioxide 
E) ammonia 
A) methane 
B) oxygen 
C) nitrogen 
D) carbon dioxide 
E) ammonia D

Question 2

The redox potential is a measure of the tendency of a substance to accept or donate electrons.

Accepted Answer

A) True 
 B)False  True

Question 3

The alternate freezing and thawing of soils results in the upward heaving of plants and building foundations.

Accepted Answer

A) True 
 B)False  True

Question 4

Alternate freezing and thawing of soils results in the "heaving" of plants and the destruction of shallow building foundations.This effect is due primarily to _____.

Accepted Answer

A) the expansion of water when it freezes 
B) the wetting and drying of swelling-type clays 
C) pressure from upward movement of water from lower horizons 
D) the breaking down of soil aggregates due to freezing and thawing 
E) the hydration of adsorbed cations on the soil colloids 
A) the expansion of water when it freezes 
B) the wetting and drying of swelling-type clays 
C) pressure from upward movement of water from lower horizons 
D) the breaking down of soil aggregates due to freezing and thawing 
E) the hydration of adsorbed cations on the soil colloids

Question 5

A mineral soil has a water content of 25 kg water per 100 kg dry soil.What is the approximate specific heat of this soil,expressed in calories per kilogram?

Accepted Answer

A) 250 
B) 450 
C) 640 
D) 360 
E) impossible to calculate. 
A) 250 
B) 450 
C) 640 
D) 360 
E) impossible to calculate.

Question 6

A wildlife biologist in South Africa notes that the soils on south-facing slopes are wetter and deeper than those on north-facing slopes,and therefore support more wildlife.What likely accounts for this difference?

Accepted Answer

A) differences in rainfall from one area to another 
B) more rapid plant growth on the south slopes 
C) higher soil temperatures on the north slopes 
D) more solar radiation on the south slopes 
E) sandier soils on the north slopes 
A) differences in rainfall from one area to another 
B) more rapid plant growth on the south slopes 
C) higher soil temperatures on the north slopes 
D) more solar radiation on the south slopes 
E) sandier soils on the north slopes

Question 7

The most important management factors influencing soil aeration in well-drained soils are those that determine the volume of the soil's macropores.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is (are)considered necessary features for an area to be delineated as a wetland?

Accepted Answer

A) hydric soils 
B) shallow standing water 
C) aquatic vegetation 
D) organic soils 
E) all of the above 
A) hydric soils 
B) shallow standing water 
C) aquatic vegetation 
D) organic soils 
E) all of the above

Question 9

The bulk of gaseous interchange in soils takes place by _____.

Accepted Answer

A) mass flow 
B) partial pressure of N2 
C) diffusion 
D) dissolution in water 
E) respiration 
A) mass flow 
B) partial pressure of N2 
C) diffusion 
D) dissolution in water 
E) respiration

Question 10

Which of the following practices would encourage higher soil temperatures in the spring in a humid-temperate area?

Accepted Answer

A) apply modest levels of organic residues 
B) follow no-till practices 
C) use a plastic mulch 
D) irrigate the soil 
E) use the moldboard plow 
A) apply modest levels of organic residues 
B) follow no-till practices 
C) use a plastic mulch 
D) irrigate the soil 
E) use the moldboard plow

Question 11

Soil A has a redox potential of 400 mV,soil B -200 mV.Of the two soils,Soil A is more apt to be characterized by an abundance of _____.

Accepted Answer

A) Fe2+ ions 
B) Mn2+ ions 
C) H+ ions 
D) S2- ions 
E) molecular oxygen 
A) Fe2+ ions 
B) Mn2+ ions 
C) H+ ions 
D) S2- ions 
E) molecular oxygen

Question 12

Conservation tillage is not practical in some areas of the Northern part of the United States because the practice lowers the surface soil temperature in the spring of the year.

Accepted Answer

A) True 
 B)False

Question 13

A soil on the south facing slope in Canada is likely to be drier and warmer than a comparable soil on a north facing slope.

Accepted Answer

A) True 
 B)False

Question 14

An abundance of macropores in soils helps assure an abundance of oxygen in the soil.

Accepted Answer

A) True 
 B)False

Question 15

Compared to upland soils,wetland soils would be characterized by an abundance of _____.

Accepted Answer

A) methane 
B) CO2 
C) NO3- 
D) SO42- 
E) Fe3+ 
A) methane 
B) CO2 
C) NO3- 
D) SO42- 
E) Fe3+

Question 16

The partial pressure of CO2 in the soil pores is higher than the partial pressure of this gas in the atmosphere.

Accepted Answer

A) True 
 B)False

Question 17

The redox potential is a measure of _____.

Accepted Answer

A) molecular oxygen content 
B) the tendency of a substance to accept or donate electrons 
C) carbon dioxide content 
D) the ferric ion content 
E) the balance between hydrogen and hydroxyl ions in solution. 
A) molecular oxygen content 
B) the tendency of a substance to accept or donate electrons 
C) carbon dioxide content 
D) the ferric ion content 
E) the balance between hydrogen and hydroxyl ions in solution.

Question 18

A well aerated soil is characterized by a relative abundance of _____.

Accepted Answer

A) micropores 
B) Fe2+ions 
C) NH4+ ions 
D) NO3- ions 
E) methane gas 
A) micropores 
B) Fe2+ions 
C) NH4+ ions 
D) NO3- ions 
E) methane gas

Question 19

Which of the following actions would best assure good aeration in a soil?

Accepted Answer

A) increase the soil temperature 
B) add organic residues 
C) use a plastic mulch 
D) use cover crops,especially legumes 
E) remove excess water 
A) increase the soil temperature 
B) add organic residues 
C) use a plastic mulch 
D) use cover crops,especially legumes 
E) remove excess water

Question 20

Which of the following is not a major factor in determining the soil aeration status?

Accepted Answer

A) redox potential 
B) volume of macropores 
C) nitrogen gas 
D) carbon dioxide 
E) oxygen 
A) redox potential 
B) volume of macropores 
C) nitrogen gas 
D) carbon dioxide 
E) oxygen

The process of aerobic respiration is a significant source of which of the following gases?

The redox potential is a measure of the tendency of a substance to accept or donate electrons.

The alternate freezing and thawing of soils results in the upward heaving of plants and building foundations.

Alternate freezing and thawing of soils results in the "heaving" of plants and the destruction of shallow building foundations.This effect is due primarily to _____.

A mineral soil has a water content of 25 kg water per 100 kg dry soil.What is the approximate specific heat of this soil,expressed in calories per kilogram?

A wildlife biologist in South Africa notes that the soils on south-facing slopes are wetter and deeper than those on north-facing slopes,and therefore support more wildlife.What likely accounts for this difference?

The most important management factors influencing soil aeration in well-drained soils are those that determine the volume of the soil's macropores.

Which of the following is (are)considered necessary features for an area to be delineated as a wetland?

The bulk of gaseous interchange in soils takes place by _____.

Which of the following practices would encourage higher soil temperatures in the spring in a humid-temperate area?

Soil A has a redox potential of 400 mV,soil B -200 mV.Of the two soils,Soil A is more apt to be characterized by an abundance of _____.

Conservation tillage is not practical in some areas of the Northern part of the United States because the practice lowers the surface soil temperature in the spring of the year.

A soil on the south facing slope in Canada is likely to be drier and warmer than a comparable soil on a north facing slope.

An abundance of macropores in soils helps assure an abundance of oxygen in the soil.

Compared to upland soils,wetland soils would be characterized by an abundance of _____.

The partial pressure of CO₂ in the soil pores is higher than the partial pressure of this gas in the atmosphere.

The redox potential is a measure of _____.

A well aerated soil is characterized by a relative abundance of _____.

Which of the following actions would best assure good aeration in a soil?

Which of the following is not a major factor in determining the soil aeration status?

The Soils Around Us

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil Water: Characteristics and Behavior

Soil and the Hydrologic Cycle

The Colloidal Fraction: Seat of Soil Chemical and Physical Activity

Soil Acidity

Soils of Dry Regionsalkalinity,salinity and Sodicity

Organisms and Ecology of the Soil

Soil Organic Matter

Nitrogen and Sulfur Economy of Soils

Soil Phosphorus and Potassium

Calcium,magnesium and Trace Elements

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Geographic Information About Soils

Prospects for Global Soil Quality As Affected by Human Activities

Filters

Exam 7: Soil Aeration and Temperature

The process of aerobic respiration is a significant source of which of the following gases?

The redox potential is a measure of the tendency of a substance to accept or donate electrons.

The alternate freezing and thawing of soils results in the upward heaving of plants and building foundations.

Alternate freezing and thawing of soils results in the "heaving" of plants and the destruction of shallow building foundations.This effect is due primarily to _____.

A mineral soil has a water content of 25 kg water per 100 kg dry soil.What is the approximate specific heat of this soil,expressed in calories per kilogram?

A wildlife biologist in South Africa notes that the soils on south-facing slopes are wetter and deeper than those on north-facing slopes,and therefore support more wildlife.What likely accounts for this difference?

The most important management factors influencing soil aeration in well-drained soils are those that determine the volume of the soil's macropores.

Which of the following is (are)considered necessary features for an area to be delineated as a wetland?

The bulk of gaseous interchange in soils takes place by _____.

Which of the following practices would encourage higher soil temperatures in the spring in a humid-temperate area?

Soil A has a redox potential of 400 mV,soil B -200 mV.Of the two soils,Soil A is more apt to be characterized by an abundance of _____.

Conservation tillage is not practical in some areas of the Northern part of the United States because the practice lowers the surface soil temperature in the spring of the year.

A soil on the south facing slope in Canada is likely to be drier and warmer than a comparable soil on a north facing slope.

An abundance of macropores in soils helps assure an abundance of oxygen in the soil.

Compared to upland soils,wetland soils would be characterized by an abundance of _____.

The partial pressure of CO2 in the soil pores is higher than the partial pressure of this gas in the atmosphere.

The redox potential is a measure of _____.

A well aerated soil is characterized by a relative abundance of _____.

Which of the following actions would best assure good aeration in a soil?

Which of the following is not a major factor in determining the soil aeration status?

The Soils Around Us

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil Water: Characteristics and Behavior

Soil and the Hydrologic Cycle

The Colloidal Fraction: Seat of Soil Chemical and Physical Activity

Soil Acidity

Soils of Dry Regionsalkalinity,salinity and Sodicity

Organisms and Ecology of the Soil

Soil Organic Matter

Nitrogen and Sulfur Economy of Soils

Soil Phosphorus and Potassium

Calcium,magnesium and Trace Elements

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Geographic Information About Soils

Prospects for Global Soil Quality As Affected by Human Activities

Filters

The partial pressure of CO₂ in the soil pores is higher than the partial pressure of this gas in the atmosphere.