Question 1

The polarity of water helps account for the attraction of water molecules for each other.

Accepted Answer

A) True 
 B)False  True

Question 2

Plant roots obtain access to soil water in which of the following ways?

Accepted Answer

A)  The roots contract and leave room in the pores for the water to move in. 
B)  Roots extend into moist soil area. 
C)  Water vapor moves from the wet soil areas to the root surfaces. 
D)  Water flows to the roots by capillarity. 
E)  both B and D 
A)  The roots contract and leave room in the pores for the water to move in. 
B)  Roots extend into moist soil area. 
C)  Water vapor moves from the wet soil areas to the root surfaces. 
D)  Water flows to the roots by capillarity. 
E)  both B and D E

Question 3

At which of the following soil moisture potentials (expressed as kPa) is the soil water held most tightly?

Accepted Answer

A)  +5 
B)  0 
C)  -31 
D)  -1500 
E)  -3100 
A)  +5 
B)  0 
C)  -31 
D)  -1500 
E)  -3100 E

Question 4

The osmotic potential is dependent upon the presence of salts and other solutes in the soil.

Accepted Answer

A) True 
 B)False

Question 5

Which of the following means of estimating soil water levels gives a direct measurement of the water content?

Accepted Answer

A)  gypsum blocks 
B)  neutron scattering 
C)  gravimetric determinations 
D)  tensiometer 
E)  pressure membrane 
A)  gypsum blocks 
B)  neutron scattering 
C)  gravimetric determinations 
D)  tensiometer 
E)  pressure membrane

Question 6

The effect of soil organic matter on the amount of water available to plants is due to organic matter influence on total soil porosity as well as to the water-supplying power of the soil organic matter.

Accepted Answer

A) True 
 B)False

Question 7

In which of the following "forms" of soil water are pesticides, excess plant nutrients and waste chemicals most apt to move through soils?

Accepted Answer

A)  gravitational 
B)  unsaturated 
C)  available 
D)  hygroscopic 
E)  capillary 
A)  gravitational 
B)  unsaturated 
C)  available 
D)  hygroscopic 
E)  capillary

Question 8

Water will move from one site in a soil with a water potential of -5 kPa to an adjacent site with a water potential of -40 kPa.

Accepted Answer

A) True 
 B)False

Question 9

At which of the following soil moisture potentials (expressed as kPa) is the waters' energy level lowest?

Accepted Answer

A)  +5 
B)  0 
C)  -31 
D)  -1500 
E)  -3100 
A)  +5 
B)  0 
C)  -31 
D)  -1500 
E)  -3100

Question 10

Capillarity in soils _____.

Accepted Answer

A)  involves both adhesion and cohesion 
B)  is enhanced by the symmetrical nature of the water molecule 
C)  is independent of the matric potential in soils 
D)  is not involved in the process of water uptake from soils 
E)  does not account for unsaturated water movement in soils 
A)  involves both adhesion and cohesion 
B)  is enhanced by the symmetrical nature of the water molecule 
C)  is independent of the matric potential in soils 
D)  is not involved in the process of water uptake from soils 
E)  does not account for unsaturated water movement in soils

Question 11

The adsorption of water on soil surfaces encourages capillarity.

Accepted Answer

A) True 
 B)False

Question 12

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the capacitance probe?

Accepted Answer

A)  requires "destructive sampling" for each measurement 
B)  good to turn on automatic irrigation at -50 kPa 
C)  used to turn on irrigation when soil moisture potential reaches -200 kPa 
D)  would give the same reading for both a loamy sand and a silt loam if both contained 15% 
E)  both A and D 
A)  requires "destructive sampling" for each measurement 
B)  good to turn on automatic irrigation at -50 kPa 
C)  used to turn on irrigation when soil moisture potential reaches -200 kPa 
D)  would give the same reading for both a loamy sand and a silt loam if both contained 15% 
E)  both A and D

Question 13

Filling the bottom half of a flower pot with gravel will greatly improve the aeration of the soil-mix in the top half.

Accepted Answer

A) True 
 B)False

Question 14

Hysteresis is the phenomenon whereby a soil has the same water content/potential relationship when it is being dried as when it is being wetted.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following best characterizes the field capacity of a soil?

Accepted Answer

A)  maximum capacity of a soil to hold water 
B)  water content of a soil with water potential of about -10 kPa 
C)  the total capillary water in a soil 
D)  a wetted soil prior to the removal of the gravitational water 
E)  soil with water potential of -1500 kPa 
A)  maximum capacity of a soil to hold water 
B)  water content of a soil with water potential of about -10 kPa 
C)  the total capillary water in a soil 
D)  a wetted soil prior to the removal of the gravitational water 
E)  soil with water potential of -1500 kPa

Question 16

The tenacity with which water is held in soils is directly related to the soil moisture content, the higher the moisture level the greater the attraction of the water to the soil.

Accepted Answer

A) True 
 B)False

Question 17

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the tensiometer?

Accepted Answer

A)  requires "destructive sampling" for each measurement 
B)  good to turn on automatic irrigation at -50 kPa 
C)  used to turn on irrigation when soil moisture potential reaches -200 kPa 
D)  would give the same reading for both a loamy sand and a silt loam if both contained 15% 
E)  both A and D 
A)  requires "destructive sampling" for each measurement 
B)  good to turn on automatic irrigation at -50 kPa 
C)  used to turn on irrigation when soil moisture potential reaches -200 kPa 
D)  would give the same reading for both a loamy sand and a silt loam if both contained 15% 
E)  both A and D

Question 18

The magnetic resonance technique of estimating soil moisture levels can also be used to estimate salt contents.

Accepted Answer

A) True 
 B)False

Question 19

Capillary movement is made possible by the processes of cohesion and adhesion.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following expressions in kPa is most apt to characterize the gravitational potential of a clay loam surface soil?

Accepted Answer

A)  -5 
B)  -30 
C)  0 
D)  +5 
E)  -3100 
A)  -5 
B)  -30 
C)  0 
D)  +5 
E)  -3100

The polarity of water helps account for the attraction of water molecules for each other.

Plant roots obtain access to soil water in which of the following ways?

At which of the following soil moisture potentials (expressed as kPa) is the soil water held most tightly?

The osmotic potential is dependent upon the presence of salts and other solutes in the soil.

Which of the following means of estimating soil water levels gives a direct measurement of the water content?

The effect of soil organic matter on the amount of water available to plants is due to organic matter influence on total soil porosity as well as to the water-supplying power of the soil organic matter.

In which of the following "forms" of soil water are pesticides, excess plant nutrients and waste chemicals most apt to move through soils?

Water will move from one site in a soil with a water potential of -5 kPa to an adjacent site with a water potential of -40 kPa.

At which of the following soil moisture potentials (expressed as kPa) is the waters' energy level lowest?

Capillarity in soils _____.

The adsorption of water on soil surfaces encourages capillarity.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the capacitance probe?

Filling the bottom half of a flower pot with gravel will greatly improve the aeration of the soil-mix in the top half.

Hysteresis is the phenomenon whereby a soil has the same water content/potential relationship when it is being dried as when it is being wetted.

Which of the following best characterizes the field capacity of a soil?

The tenacity with which water is held in soils is directly related to the soil moisture content, the higher the moisture level the greater the attraction of the water to the soil.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the tensiometer?

The magnetic resonance technique of estimating soil moisture levels can also be used to estimate salt contents.

Capillary movement is made possible by the processes of cohesion and adhesion.

Which of the following expressions in kPa is most apt to characterize the gravitational potential of a clay loam surface soil?

The Soils Around Us

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil and the Hydrologic Cycle

Soil Aeration and Temperature

The Colloidal Fraction: Seat of Soil Chemical and Physical Activity

Soil Acidity, Alkalinity, Aridity and Salinity

Organisms and Ecology of the Soil

Soil Organic Matter Overview

Nutrient Cycles and Soil Fertility

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

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Exam 5: Soil Water: Characteristics and Behavior

The polarity of water helps account for the attraction of water molecules for each other.

Plant roots obtain access to soil water in which of the following ways?

At which of the following soil moisture potentials (expressed as kPa) is the soil water held most tightly?

The osmotic potential is dependent upon the presence of salts and other solutes in the soil.

Which of the following means of estimating soil water levels gives a direct measurement of the water content?

The effect of soil organic matter on the amount of water available to plants is due to organic matter influence on total soil porosity as well as to the water-supplying power of the soil organic matter.

In which of the following "forms" of soil water are pesticides, excess plant nutrients and waste chemicals most apt to move through soils?

Water will move from one site in a soil with a water potential of -5 kPa to an adjacent site with a water potential of -40 kPa.

At which of the following soil moisture potentials (expressed as kPa) is the waters' energy level lowest?

Capillarity in soils _____.

The adsorption of water on soil surfaces encourages capillarity.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the capacitance probe?

Filling the bottom half of a flower pot with gravel will greatly improve the aeration of the soil-mix in the top half.

Hysteresis is the phenomenon whereby a soil has the same water content/potential relationship when it is being dried as when it is being wetted.

Which of the following best characterizes the field capacity of a soil?

The tenacity with which water is held in soils is directly related to the soil moisture content, the higher the moisture level the greater the attraction of the water to the soil.

Which of the following statements concerning applications or capabilities of soil moisture measuring devices is (are) true for the tensiometer?

The magnetic resonance technique of estimating soil moisture levels can also be used to estimate salt contents.

Capillary movement is made possible by the processes of cohesion and adhesion.

Which of the following expressions in kPa is most apt to characterize the gravitational potential of a clay loam surface soil?

The Soils Around Us

Formation of Soils From Parent Materials

Soil Classification

Soil Architecture and Physical Properties

Soil and the Hydrologic Cycle

Soil Aeration and Temperature

The Colloidal Fraction: Seat of Soil Chemical and Physical Activity

Soil Acidity, Alkalinity, Aridity and Salinity

Organisms and Ecology of the Soil

Soil Organic Matter Overview

Nutrient Cycles and Soil Fertility

Practical Nutrient Management

Soil Erosion and Its Control

Soils and Chemical Pollution

Filters