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Soil Science Final - Quiz

Beschreibung

Quiz am Soil Science Final - Quiz, erstellt von Meagan F am 10/12/2016.
Meagan F
Quiz von Meagan F, aktualisiert more than 1 year ago
Meagan F
Erstellt von Meagan F vor etwa 8 Jahre
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Zusammenfassung der Ressource

Frage 1

Frage
In nature, beneficial mycorrhizae form with the roots of ____.
Antworten
  • coniferous trees
  • grasses
  • legumes
  • broad leaf trees
  • all of these

Frage 2

Frage
The second most important biological process on earth is
Antworten
  • photosynthesis
  • nitrogen volatilization
  • sulfur oxidation
  • nitrification
  • none of the above

Frage 3

Frage
The site of nutrient transfer between a plant and an ectomycorrhizal fungus is called the _____.
Antworten
  • arbuscule
  • Hartig net
  • mantle
  • absorptive hyphae

Frage 4

Frage
Nitrogenase enzyme activity is inhibited by:
Antworten
  • high oxygen
  • low available C
  • low pH
  • all of these
  • none of these

Frage 5

Frage
The site of nutrient transfer between a plant and an endomycorrhizal fungus is called the ____.
Antworten
  • arbuscule
  • Hartig net
  • mantle
  • absorptive hypphate

Frage 6

Frage
Nitrogen fixing bacteria move through a(n) [blank_start]____[blank_end] to the [blank_start]____[blank_end] which are produced by the plant in the cortical cells, where they reproduce and begin to fix nitrogen.
Antworten
  • root cortex
  • infection thread
  • stomate
  • nodules
  • stem

Frage 7

Frage
During symbiotic nitrogen fixation, the plant benefits by:
Antworten
  • gaining nitrogen
  • gaining carbon
  • getting protection against pathogens
  • the acidification of the root zone
  • none of the above

Frage 8

Frage
Ectomycorrhizae:
Antworten
  • penetrate the root cortex cells and produce tree-like structures for nutrient exchange with the plant
  • create a net-like structure between root cortex cells and on the outside of the roots
  • create nodules inside root cells where nutrient exchange with the plant takes place
  • kill the roots and reduce plant nutrient uptake

Frage 9

Frage
[blank_start]___[blank_end] is produced by the [blank_start]___[blank_end] to maintain [blank_start]___[blank_end] levels of [blank_start]___[blank_end] required for nitrogenase activity.
Antworten
  • Leghemoglobin
  • Hemoglobin
  • plant
  • bacteria
  • high
  • low
  • carbon dioxide
  • oxygen

Frage 10

Frage
The main benefit for the plant of having a symbiotic relationship with mycorrhizal fungi is:
Antworten
  • increased nitrogen availability
  • increased root surface area for nutrient uptake
  • protection against root pathogens
  • increased oxygen in the root for cellular respiration

Frage 11

Frage
Nitrogen is a component of which essential plant compounds?
Antworten
  • chlorophyll
  • enzymes
  • DNA
  • all of the above

Frage 12

Frage
At low soil pH,
Antworten
  • all nutrients are at deficient levels
  • Ca, Mg, and P are at deficient levels, and Al is at toxic levels
  • Most nutrients tend to be at toxic levels
  • Ca, Mg, and P are at toxic levels, and Al is fixed in insoluble compounds
  • All nutrient elements are at levels that support good plant growth

Frage 13

Frage
Soils in humid climates tend to acidify [blank_start]___[blank_end] than soils in dry climates because there is [blank_start]___[blank_end] leaching of [blank_start]___[blank_end] cations.
Antworten
  • faster___
  • slower
  • more
  • less
  • acidic
  • basic

Frage 14

Frage
Which of the following would not be a liming material?
Antworten
  • MgCO₃
  • Ca(OH)₂
  • CaSiO₂
  • CaSO₄
  • All of these are lime

Frage 15

Frage
The type of microorganism that becomes dominant in the final stage of decomposition and breaks down chitin, cellulose, lignins, and waxes is [blank_start]___[blank_end].
Antworten
  • Fungi
  • protists
  • actinomycetes
  • bacteria

Frage 16

Frage
Predators that help regulate decomposition rate include:
Antworten
  • Protists and nematodes
  • Bacteria and fungi
  • Actinomycetes
  • Termites

Frage 17

Frage
Humus is in which pool of organic matter?
Antworten
  • active
  • slow
  • rapid
  • passive

Frage 18

Frage
The humus pool of soil organic matter
Antworten
  • has a C:N of about 10:1
  • decomposes within 1 to 2 years
  • is very stable
  • decomposes within 5 to 10 years

Frage 19

Frage
Which of the following statements is true about soil organic matter?
Antworten
  • It cannot be increased in the soil indefinitely
  • Application to the soil always leads to lots of immediately available nitrogen
  • It breaks down more rapidly is the soil is tilled
  • A and B only
  • A and C only

Frage 20

Frage
The rate of organic matter decomposition is fastest under which of the following set of conditions?
Antworten
  • Acid pH, moist soils, warm temperatures, good aeration, residues left on soil surface
  • Alkaline pH, dry soils, cool temperatures, good aeration, residues incorporated into soil
  • Neutral pH, moist soils, warm temperatures, poor aeration, residues left on soil surface
  • Neutral pH, moist soils, warm temperatures, good aeration, residues incorporated

Frage 21

Frage
Which of the follow C:N ratios will most likely result in a moderate rate of organic matter breakdown with no short term changes in the soil nitrogen?
Antworten
  • 5:1
  • 25:1
  • 100:1
  • 1000:1

Frage 22

Frage
Long-term tillage tends to reduce the amount of organic matter in a soil because
Antworten
  • tillage incorporates residues into the soil
  • tillage reduces soil aeration
  • tillage reduces soil erosion
  • tillage reintroduces oxygen into the soil

Frage 23

Frage
In aerobic respiration by microbes, [blank_start]___[blank_end] is absorbed, and [blank_start]___[blank_end] is released.
Antworten
  • N₂
  • CO₂
  • O₂
  • O₂
  • N₂
  • CO₂

Frage 24

Frage
Soil organisms that reproduce rapidly and degrade the simple compounds found in fresh organic matter added to the soil are the ___.
Antworten
  • fungi
  • rotifers
  • bacteria
  • earthworms

Frage 25

Frage
An important function of humus is to:
Antworten
  • help establish and maintain strong granular soil structure
  • hold onto water very tightly so that only soil microorganisms can use it
  • provide large quantities of quickly available plant nutrients
  • provide easily degradable carbon compounds for soil microorganisms

Frage 26

Frage
Which of the following management practices would most likely be necessary if growing food crops on Spodosols?
Antworten
  • frequent use of soil tillage and conservation
  • use of erosion control measures such as terracing
  • addition of liming agents
  • supplying water through irrigation

Frage 27

Frage
Gelisols:
Antworten
  • are old, deeply weathered soils developed from intrusive volcanic rock
  • contain a permafrost layer within the top 2 meters
  • contain slickensides
  • include all soils with a histic epipedon
  • none of the above

Frage 28

Frage
Slickensides may be found in:
Antworten
  • vertisols
  • mollisols
  • andisols
  • oxisols
  • none of the above

Frage 29

Frage
Andisols:
Antworten
  • are old, deeply weathered soils developed from intrusive volcanic rock
  • contain slickensides
  • form on unstable landscape positions undergoing erosion and deposition
  • contain a permafrost layer within the top 2 meters
  • none of the above

Frage 30

Frage
Ultisols:
Antworten
  • form on unstable landscape positions undergoing erosion and deposition
  • form on old, stable land surfaces in warm humid climates
  • are the most weathered soils
  • contain slickensides

Frage 31

Frage
The role of soil animals in organic matter decomposition is to:
Antworten
  • shred and mix fresh organic matter into the soil
  • decompose waxes and lignins
  • feed on bacteria and fungi

Frage 32

Frage
The organic matter content of a loam soil declined from 5% to 2% as a result of continued cultivation/tillage. This will result in:
Antworten
  • deterioration of soil structure
  • deterioration of soil texture
  • stabilization of soil structure
  • increase in crop yield

Frage 33

Frage
The majority of nutrient release occurs during the decomposition of:
Antworten
  • humus
  • the slow pool of organic matter
  • the active pool of organic matter
  • the passive pool of organic matter

Frage 34

Frage
The pool of organic matter most impacted by organic matter additions in agriculture is:
Antworten
  • humus
  • the slow pool
  • the active pool
  • the passive pool

Frage 35

Frage
The "active" pool usually makes up less than [blank_start]___[blank_end] percent of the total organic matter in a soil.
Antworten
  • 10
  • 1
  • 0.1
  • 0.01

Frage 36

Frage
Which of the following are characteristics of the majority of microorganisms involved in soil organic matter decomposition?
Antworten
  • they get C from CO₂ and energy from oxidation of organic compounds
  • they get C and energy from oxidation of organic compounds
  • they get C from CO₂ and energy from oxidation of inorganic compounds
  • none of the above

Frage 37

Frage
The basic unit of soil classification is the:
Antworten
  • order
  • great group
  • family
  • series

Frage 38

Frage
Criteria for grouping soils into orders include:
Antworten
  • soil forming processes as indicated by the presence or absence of major diagnostic horizons
  • the thickness of major diagnostic horizons
  • soil temperature, mineralogy, and particle size
  • the specific location of the soil

Frage 39

Frage
The highest level of soil classification is the family.
Antworten
  • True
  • False

Frage 40

Frage
The soil moisture regime that is used in regions where there are cool, moist winters and long, dry summers with drought is called:
Antworten
  • udic
  • xeric
  • aridic
  • ustic
  • aquic

Frage 41

Frage
The warmest soil temperature regime is called:
Antworten
  • thermic
  • frigid
  • mesic
  • cryic

Frage 42

Frage
The Los Osos soil is classified as an Argixeroll. To what soil Order does it belong?
Antworten
  • Mollisol
  • Vertisol
  • Gelisol
  • Spodosol
  • Alfisol

Frage 43

Frage
This soil order commonly forms out of serpentenite parent material and is characterized as having an abundance of smectite clay. It is not good for building on as it swells during wet periods and shrinks during dry periods.
Antworten
  • Mollisol
  • Aridisol
  • Alfisol
  • Ultisol
  • Vertisol

Frage 44

Frage
The State Soil of California, San Joaquin, is classified as a Durixeralf. To what soil Order does it belong?
Antworten
  • Mollisol
  • Vertisol
  • Gelisol
  • Spodosol
  • Alfisol

Frage 45

Frage
Supposing you want to grow corn, soils of which soil order would be best, based on natural fertility?
Antworten
  • Mollisol
  • Alfisol
  • Aridisol
  • Entisol
  • Ultisol

Frage 46

Frage
Which soil order is commonly found on steep backslope landscape positions or in soils where little or no weathering has taken place?
Antworten
  • Ultisol
  • Entisol
  • Andisol
  • Alfisol
  • Aridisol

Frage 47

Frage
Soils in this order are commonly sandy in texture, quite acidic and develop primarily under coniferous trees in cool to cold climates:
Antworten
  • Mollisols
  • Andisols
  • Spodosols
  • Alifisols
  • Ultisols

Frage 48

Frage
A soil on the dry slopes of the Northern Cascades of California is classified as an Xerept. To what soil Order does it belong?
Antworten
  • Inceptisol
  • Alfisol
  • Mollisol
  • Ultisol
  • Oxisol

Frage 49

Frage
Permafrost is:
Antworten
  • material that remains below 0 degrees Celsius for more than two consecutive years
  • is permanently frozen
  • a surface horizon developed by frost heaving
  • is found in soils in the Order Histosols
  • none of the above

Frage 50

Frage
Aridisols often contain which of the following horizons?
Antworten
  • mollic
  • histic
  • albic
  • calcic
  • none of the above

Frage 51

Frage
Vertisols develop from parent materials rich in [blank_start]___[blank_end]
Antworten
  • K
  • Ca and Mg
  • Na
  • Na and K

Frage 52

Frage
Which soil order, containing highly weathered soils composed mainly or iron and aluminum oxide clay, is found in the humid tropics?
Antworten
  • Histosol
  • Vertisol
  • Ultisol
  • Oxisol
  • none of the above

Frage 53

Frage
Soils that are commonly sandy in texture, quite acidic and develop primarily under coniferous trees in cool to cold climates often contain which of the following horizons?
Antworten
  • permafrost
  • argillic
  • albic
  • mollic
  • oxic

Frage 54

Frage
The most dominant soil forming factor for an Aridisol soil would be [blank_start]___[blank_end]
Antworten
  • climate
  • parent material
  • time
  • topography
  • vegetation

Frage 55

Frage
Characteristics of kaolinite clays include:
Antworten
  • made up of Fe or Al and O, very little net negative charge, positive charge at low pH, low plasticity, stickiness, and water holding
  • significant substitution in the octahedral, layers weakly held together by cations (highly expansible), CEC of 80-120 cmolc/kg
  • significant substitution in the tetrahedra, layers tightly bound (moderately expansible), CEC of 100-180 cmolc/kg
  • significant substitution in the tetrahedra, potassium ions hold clay layers together tightly (non-expansible), CEC of 20-40 cmolc/kg
  • limited isomorphous substitution, layers are H-bonded (non-expansible), CEC of 2-5 cmolc/kg

Frage 56

Frage
The main cations found on the cation exchange complex at a soil pH between 6 and 7 are:
Antworten
  • Ca, Al, H
  • Ca, Mg, K
  • K, Al(OH), Mg
  • Al, H, K

Frage 57

Frage
Which of the following will be readily leached from soils because of the properties it has that influence how tightly they are held on the exchange complex of clay?
Antworten
  • Al
  • H
  • Ca
  • Na

Frage 58

Frage
Two major types of soil colloids are:
Antworten
  • crystalline silicate clays and humus
  • basic cations and humus
  • crystalline silicate clays and quartz sands
  • primary minerals and secondary minerals
  • quartz sands and humus

Frage 59

Frage
Cation exchange capacity is
Antworten
  • the amount of exchangeable negatively charged ions per unit weight of dry soil
  • the amount of exchangeable negatively charged and neutral ions per unit weight of soil
  • the amount of exchangeable positively charged ions held per unit weight of dry soil
  • the amount of exchangeable H ions per unit weight of dry soil

Frage 60

Frage
Which cation would you expect to find tightly held in a soil at pH 4.5?
Antworten
  • K
  • Ca
  • Na
  • Mg
  • Al

Frage 61

Frage
The swelling/shrinking tendency of some silicate clay minerals is due primarily to:
Antworten
  • the presence of cations attracted by the negative charges on the internal surfaces
  • the movement of water molecules in and out of the interlayers of the crystal
  • varying thickness of the film of water covering the external surface of the particles
  • expansion in the width of the interlayers due to movement of larger ions such as K+
  • the high Mg^2+ contents in the octahedral layers

Frage 62

Frage
The accumulation or loss of what compounds result in the formation of hydric soil indicators?
Antworten
  • iron, manganese, sulfur, or carbon
  • nitrogen, phosphorus, or potassium
  • iron, carbon, sulfur, or nitrogen
  • iron, manganese, sulfur, or arsenic

Frage 63

Frage
Which of the follow is not a characteristic of soil colloids?
Antworten
  • very small size
  • high external surfaces
  • electronegativity charges
  • ability to exchange ions with the soil solution
  • low water holding capacity

Frage 64

Frage
The criteria required to define wetlands are wetland hydrology, hydric soils, and [blank_start]___[blank_end]
Antworten
  • water standing on the surface
  • clay subsoils
  • hydrophytic vegetation

Frage 65

Frage
Conditions required to form hydric soil indicators are elements that reduce, seasonal or permanent water saturation, microorganisms, and [blank_start]___[blank_end]
Antworten
  • water standing on the surface
  • an organic carbon source
  • hydrophytic vegetation
  • clay subsoils

Frage 66

Frage
The diffusion rate of oxygen in water is 10,000 times [blank_start]___[blank_end] than in air.
Antworten
  • faster
  • slower

Frage 67

Frage
Possible ecological consequences of poor soil aeration include:
Antworten
  • slow organic matter decomposition
  • release of greenhouse gases into the atmosphere
  • reduced plant photosynthesis

Frage 68

Frage
A major determinant of the aeration status of soils is:
Antworten
  • dominant type of clay present
  • pore size and continuity
  • types of wetland plants present
  • presence or absence of carbonates

Frage 69

Frage
Which type of water includes that which is available to plants?
Antworten
  • hygroscopic water
  • capillary water
  • gravitational water
  • free water

Frage 70

Frage
Water moves through soil to plant roots by:
Antworten
  • capillary flow from high to low water potential
  • hygroscopic flow
  • transpiration
  • capillary flow from low to high water potential
  • gravitational flow

Frage 71

Frage
Water moves further in finer textured soils because:
Antworten
  • the granular structure in fine textured soils allows for stronger attraction between water and particles
  • more space between particles causes the bonds of cohesion between water molecules to be stronger
  • there is less space between the particles and the water film is unbroken for longer distances
  • more water is lost by plant transpiration in fine textured soils

Frage 72

Frage
The bulk of gaseous interchange in soils takes place by:
Antworten
  • mass flow
  • differences in the pressure of N gas
  • diffusion of individual gases along their concentration gradients
  • moving as dissolved ions in soil water
  • aerobic respiration

Frage 73

Frage
Clay soils hold more water but have less PAW than loamy soils because:
Antworten
  • there is less gravitational water in clay
  • plant roots cannot grow as well in clay soils
  • more hygroscopic water is held on clay particles
  • loamy soils have smaller pores

Frage 74

Frage
Sandy soils have less PAW than loamy soils because:
Antworten
  • there is less gravitational water in sandy soil
  • plant roots grow better in sandy soils so they use the water faster
  • more hygroscopic water is held on sand particles
  • sandy soils have less surface area

Frage 75

Frage
Which type of water is not "held" in soils?
Antworten
  • hygroscopic
  • gravitational
  • capillary
  • water of cohesion

Frage 76

Frage
Capillarity in soils:
Antworten
  • involves both adhesion and cohesion
  • is enhanced by the symmetrical nature of the water molecule
  • is independent of the matric potential in soils
  • does not account for unsaturated water movement in soils

Frage 77

Frage
Which type of bond controls retention and movement of water in soils?
Antworten
  • capillary
  • covalent
  • pH-dependent
  • hydrogen

Frage 78

Frage
PAW is highest in soils with the following texture:
Antworten
  • sand
  • sandy loam
  • silty clay loam
  • clay

Frage 79

Frage
The electronegative charge on 2:1 type silicate clays is due primarily to:
Antworten
  • ionization of surface OH groups
  • substitution of one metallic atom for another in the crystal structure
  • extremely small size of the individual colloid particles
  • the effect of pH on the presence of H+ ions in the exchange complex
  • the preponderance of tetrahedron sheets compared to octahedron sheets

Frage 80

Frage
Formation of granular aggregates is aided by:
Antworten
  • fungal hyphae
  • fine roots
  • microbial and plant exudates

Frage 81

Frage
Soils developed from accumulated organic material have which of the following characteristics?
Antworten
  • flat, high in clay, and fertile
  • coarse, stony, with fast drainage
  • light, porous, and productive
  • clayey and poorly drained

Frage 82

Frage
Secondary minerals are not found in:
Antworten
  • metamorphic and sedimentary rocks
  • soils and lacustrine sediments
  • soils and sedimentary rocks
  • igneous rocks and the atmosphere
  • soils and metamorphic rocks

Frage 83

Frage
Compared to silt, clay-sized particles are characterized by:
Antworten
  • greater attraction for water
  • greater proportion of primarily minerals
  • less attraction for water
  • less capacity to hold nutrients in plant-available forms

Frage 84

Frage
Fine sand and smaller particles move parallel to the ground and upward by:
Antworten
  • Creep
  • Flow
  • Suspension
  • Turbulence
  • Saltation

Frage 85

Frage
Which of the following would NOT reduce water erosion by controlling soil detachment?
Antworten
  • barriers
  • stubble mulching
  • conservation tillage
  • cover crops
  • no-till farming practices

Frage 86

Frage
Causes of soil erosion include:
Antworten
  • over-harvesting timberland
  • overgrazing rangeland
  • fire
  • poor farming practices

Frage 87

Frage
Terracing is a means of reducing [blank_start]___[blank_end]
Antworten
  • soil transport by wind
  • soil detachment
  • soil transport by water
  • soil saltation in wind

Frage 88

Frage
When water concentrates in small channels as it runs from the soil surface, it is called [blank_start]___[blank_end] erosion.
Antworten
  • gully
  • wind
  • rill
  • sheet

Frage 89

Frage
The majority of soil particle movement during wind erosion occurs as:
Antworten
  • Creep
  • Flow
  • Suspension
  • Turbulence
  • Saltation

Frage 90

Frage
The total global soil lost through erosion is generally greater from [blank_start]___[blank_end] erosion.
Antworten
  • gully
  • rill
  • sheet
  • wind

Frage 91

Frage
Land degradation includes which of the following effects on soil?
Antworten
  • decline in soil structure
  • reduced microbial biomass
  • salinization

Frage 92

Frage
Sulfuric acid can be used instead of gypsum to reclaim sodic soils that contain:
Antworten
  • a high buffering capacity
  • free NaCO₃
  • free CaCO₃
  • a high CEC

Frage 93

Frage
The exchangeable sodium percentage (ESP):
Antworten
  • predicts soil pH by indicating the amount of sodium there is in the soil in relation to the H ions on the exchange complex
  • predicts soil CEC by calculating the amount of sodium there is on the exchange complex
  • expresses the ratio of sodium to aluminum in the octahedral sheet of 2:1 clays
  • indicates the hazard of sodium-induced soil dispersion

Frage 94

Frage
Under what precipitation-to-ET conditions would the most severe soil salinization develop?
Antworten
  • Ratio of 0.25
  • Ratio of 0.75
  • Ratio of 1.25
  • Ratio of 2.25

Frage 95

Frage
Your soil begins to disperse and crop yields decline several years after you start irrigating your garden plot. Which of the following would most likely account for this situation?
Antworten
  • high content of Ca and Mg in the irrigation water
  • high content of Na in the irrigation water
  • excessive drainage of the soil
  • high gypsum content in the soil

Frage 96

Frage
Sodic soils generally have a poor physical condition. This is most likely due to:
Antworten
  • low OM content
  • dispersal of the Na saturated soil colloids
  • impact of raindrops on the soil surface
  • precipitation of the Ca and Mg ions as carbonates
  • high content of smectite in the soils

Frage 97

Frage
Techniques for managing saline soils include:
Antworten
  • keeping the plant root zone wet during sensitive crop stages
  • adding CaCO₃ to replace the Na on the exchange complex
  • applying excess water to increase leaching

Frage 98

Frage
Overliming:
Antworten
  • may occur on coarse-textured soils with low OM
  • may result in NH₃ volatilization if NH₄ is present
  • may result in Fe, Mn, Cu, Zn, P, and B deficiencies

Frage 99

Frage
The major role of potassium in plants is:
Antworten
  • as part of the chlorophyll molecule
  • regulating cellular respiration
  • energy storage
  • regulating the opening and closing of stomates

Frage 100

Frage
Organic forms of P make up about [blank_start]___[blank_end] of total P in the soil.
Antworten
  • 98%
  • 50%
  • 25%
  • 1%

Frage 101

Frage
Available forms of potassium in the soil usually make up about [blank_start]___[blank_end] of total potassium.
Antworten
  • 95-98%
  • 25-50%
  • 10%
  • 0.1-2%

Frage 102

Frage
The process of [blank_start]___[blank_end] releases soluble nitrogen as the result of the breakdown of nitrogen-rich organic compounds.
Antworten
  • nitrification
  • denitrification
  • symbiosis
  • volatilization
  • mineralization

Frage 103

Frage
[blank_start]___[blank_end] is the process of reduction of NO₃₋ to nitrogen gas by microorganisms under [blank_start]___[blank_end] soil conditions.
Antworten
  • Nitrification
  • Denitrification
  • Volatilization
  • Mineralization
  • aerobic
  • anaerobic
  • acidic
  • alkaline

Frage 104

Frage
A pH in the range of [blank_start]___[blank_end] is when phosphorus is most available to plants.
Antworten
  • 3.5-4.5
  • 4.5-5.5
  • 5.5-7.0
  • 7.0-8.0
  • >8.0

Frage 105

Frage
The highly mobile form of N, which is the main source of N for plants, is:
Antworten
  • NH₃
  • NH₄
  • NO₃
  • N₂

Frage 106

Frage
The nutrient most limiting for growing food crops in the world is [blank_start]___[blank_end].
Antworten
  • phosphorus
  • carbon
  • nitrogen
  • potassium
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