Soil Science – Agriculture Board Exam Reviewer (Set 2)



  • Question of

    Soil is a medium for plant growth because plant depends on soil to supply four needs Such as , except one:

    • Anchorage
    • Carbon dioxide
    • Nutrients and water
    • Oxygen
  • Question of

    Soil is made of solid particles , between these solid particles are pore spaces that contain gases and / or water . This arrangement of solid particles and pore spaces is called

    • Soil texture
    • Soil pitting
    • Soil amendment
    • Soil classification
    • Soil matrix
  • Question of

    Agricultural uses of soil are as follows, except one:

    • Recreation
    • Grazing land
    • Forestry
    • Cropland
  • Question of

    Plant leaves collect sunlight to use the sun’s energy in the process known as

    • Transpiration
    • Respiration
    • Photosynthesis
    • Metabolism
  • Question of

    The roots absorb water and nutrients from the soil solution . Water reaches roots in two ways either

    • a. Water flows toward the root
    • b. Through the root hairs
    • c. Roots grows into moist soil
    • d. A & B
    • e. A & C
    • e. A & C
  • Question of

    Eighteen nutrients are required by the plant , how much nutrients obtain by plant in the soil

    • 9
    • 10
    • 11
    • 12
    • 13
  • Question of

    A vertical section through the soil extending well into the unweathered parent material and exposing all the horizons is called

    • Soil horizon
    • Soil profile
    • Soil structure
    • Soil sampling
    • Soil pitting
  • Question of

    A section of soil extending from the surface to the depth of root penetration of the deepest rooted plants

    • Pedon
    • Soil profile
    • Parent material
    • Mottling
    • Plow pan
  • Question of

    The thin layer of soil and is defined as the surface mineral horizon with an organic matter accumulation is called

    • Horizon C
    • Horizon E
    • Horizon A
    • Horizon K
    • Horizon B
  • Question of

    The basic material of the earth’s crust is called

    • Igneous rock
    • Sedimentary rock
    • Metamorphic rock
    • Shale e. Marble
  • Question of

    A soils whose parent materials were carried and deposited in moving fresh water to form sediments is called

    • Residual soil
    • Transported soil
    • Soil surface
    • Alluvial soil
    • Sub-soil
  • Question of

    Five factors govern the soil development process are, except one:

    • Parent material
    • Weathering
    • Climate
    • Topography
    • Life and time
  • Question of

    Parent material deposited more simply by sliding or rolling down a slope . This material is scattered in hilly or mountainous areas and is called

    • Lacustrine
    • Colluvium
    • Eolian
    • Alluvian
    • Residual
  • Question of

    An organic layer made of wholly or partially decayed plant and animal debris . This horizon generally occurs in a virgin soil is called

    • A horizon
    • O horizon
    • B horizon
    • R horizon
    • C horizon
  • Question of

    The ease with which air and water and roots pass more through the soil is called

    • Permeability
    • Porosity
    • Structure
    • Percolation
    • Density
  • Question of

    A factor govern the soil development process which affects soil formation by changing water movement and soil temperature which result in low area have a deep, rich soil that drain slowly while causes erosion in slopes thin soil is

    • Parent material
    • Weathering
    • Topography
    • Time/life
    • Climate
  • Question of

    This part of the soil profile is where most plant roots grow and it is consist of A. E and B horizons together is called

    • Sodic
    • Pedon
    • Solum
    • Alluvial
    • Outwash
  • Question of

    Most mineral soils come from parent materials moved from one area to another by , except one:

    • Ice
    • Water
    • Temperature
    • Wind
    • Gravity
  • Question of

    A term that refers to the size of the mineral particles in the soil. The size of soil particles, in turn, affects such as soil traits as water holding capacity and aeration is called

    • Soil structure
    • Hydraulic conductivity
    • Infiltration
    • Permeability
    • Soil texture
  • Question of

    A term refers to the behavior of soil when the pressure is applied . It relates to the degree that soil particles stick to one another and mostly results from certain types of clay is called

    • Soil structure
    • Soil texture
    • Soil porosity
    • Soil consistence
    • Soil separates
  • Question of

    Plasticity is how easily soil can molded between the fingers while to determine stickiness, some soil is pressed between thumb and forefinger , and the amount that sticks to the fingers is noted. This stickiness and plasticity is describe in what soil?

    • Wet soil
    • Moist soil
    • Acid soil
    • Dry soil
    • Alluvial soil
  • Question of

    Clumps of soil caused by tillage is called

    • Clods
    • Peds
    • Friable
    • Mottling
    • Caliche
  • Question of

    The physical condition of the soil for growing plants results from the interaction of consistence , texture, structure and permeability which is called

    • Soil tilth
    • Soil porosity
    • Soil triangle
    • Bulk density
    • Gleying
  • Question of

    Governs the way water behaves in the soil and influences how easily a soil can be worked is a physical property of the soil called

    • Soil consistence
    • Soil structure
    • Soil texture
    • Soil porosity
    • Soil aggregates
  • Question of

    Soil consistence measure traits such as

    • Stickiness
    • Plasticity
    • Friability
    • Friability
    • All of the choices
  • Question of

    Improving tilth is largely a matter of improving structure and avoiding compaction. The following practices can help improve tilth, except one:

    • Increase the number of tillage operations
    • Add lime where needed
    • Never work wet soil , and avoid quite dry ones as well
    • Avoid unnecessary traffic over the soil
    • Avoid unnecessary traffic over the soil
  • Question of

    Nutrients plants get from air and water are , except one:

    • Hydrogen
    • Carbon
    • Oxygen
    • Nitrogen
  • Question of

    A soil color which suggest that the soil is waterlogged for part but not all of the year

    • Brown to black
    • White to light gray
    • Yellow to red
    • Bluish- gray
    • Mottle color
  • Question of

    The arrangement of soils into classes of several levels

    • Soil amendment
    • Soil classification
    • Soil fertility
    • Soil conservation
    • Soil pitting
    • Soil pitting
  • Question of

    Soil water moves upward in the soil as the surface layer dry moving from areas of high potential to areas of low potential . This upward movement is called

    • Capillary flow
    • Capillary
    • Capillary rise
    • Capillary water
    • Capillary fringe
  • Question of

    That part of soil water that can be absorbed by plant roots is called

    • Hydroscopic water
    • Cohesion water
    • Gravitational water
    • Available water
    • None of the choices
  • Question of

    A soil which held loosely and can be absorbed by plants is called sometimes as capillary water is known as

    • Adhesion water
    • Gravitational water
    • Available water
    • Cohesion water
    • None of the choices
  • Question of

    The lack of oxygen results from water-logging so bluish – gray color indicates poor soil drainage . The occurrence of this color is called

    • Mottling
    • Chroma
    • Hue
    • Talus
    • Gleying
  • Question of

    The absorption of water by plants roots is also govern by the

    • Soil moisture tension
    • Field capacity
    • Soil –water potential
    • Hydraulic conductivity
    • Adhesion
  • Question of

    Breaking of plant stems because of stem , weakness , often caused by excess nitrogen and/on potassium is called

    • Mulching
    • Pudding
    • Bleeding
    • Chiseling
    • Lodging
  • Question of

    Fungi that form a symbiotic relationship with plant roots . The fungi help the plant absorb water and nutrients while they receive food from the plant is called

    • Actinomycetes
    • Heterotroph
    • Mycorrhizae
    • Nitrogen Fixing Bacteria
    • Mycelium
  • Question of

    Many actinomycete species produce chemicals that stop the growth of other microorganism is a phenomenon called

    • Protagonism
    • Antagonism
    • Symbiotic
    • Autotroph
    • Fixation
  • Question of

    A process by which certain soil microbes convert organic nitrogen to ammonia is called

    • Nitrogen fixation
    • Denitrification
    • Mineralization
    • Ammonification
    • Immobilization
  • Question of

    A certain bacteria blue-green algae , and actinomycetes can use it . They are absorb the gas and convert it to ammonia that plants can use . This process is called

    • Nitrogen fixation
    • Non –symbiotic nitrogen fixation
    • Symbiotic nitrogen
    • Mineralization
    • Denitrification
  • Question of

    Fruiting bodies grow from the mycelium . These bodies release spores that may be considered the seeds of what?

    • Nematodes
    • Algae
    • Fungi
    • Bacteria
    • Amoeba
  • Question of

    That portion of the soil that includes animal and plant remains at various stages of decay is called

    • Organic matter
    • Solid phase
    • Liquid phase
    • Gas phase
    • None of the choices
  • Question of

    A type of soil water which is too tightly held by adhesion to be used by plants is called

    • Gravitational water
    • Capillary water
    • Hygroscopic water
    • Ground water
    • None of the choices
  • Question of

    Rainfall that cannot be absorbed into soil fast enough runs into streams or lakes . This water is called

    • Ground water
    • Gravitational water
    • Surface water
    • Run off
    • Soil water
  • Question of

    Some crop are planted to be turned into the soil rather than for harvest . This practice is called

    • Compost making
    • Humus making
    • Green manuring
    • Cover crop
    • None of the choices
  • Question of

    These nutrients are held in the soil because they are attracted to clay and humus

    • Soil mineral
    • Organic matter
    • Adsorbed mineral
    • Soil mineral and organic matter
    • None of the choices
  • Question of

    Dissolved ions are the most readily available form of nutrients . The mixture of ions soil water is termed

    • Soil colloids
    • Micelle
    • Hydroponic
    • Sesquioxides
    • Soil solution
  • Question of

    Applies to the loss of nitrogen in ammonium fertilizers and urea as soil reactions convert it to ammonia which is lost to the atmosphere is called

    • Mineralization
    • Immobilization
    • Volatilization
    • Denitrification
    • Nitrification
  • Question of

    A material spread on the soil surface , like straw , leaves , plastic or stones to protect soil from rain impact , evaporation and heaving is called

    • Levee
    • Talus
    • Mulch
    • Aquifer
    • Loess
  • Question of

    The soil is storehouse of plant nutrients . The nutrients are stored in many forms , some very available to plants , some less so. . How do you called the ability of the soil to supply nutrients for plant growth

    • Fertilization
    • Soil conservation
    • Soil fertility
    • Soil colloids
    • None of the choice
  • Question of

    The primary macronutrients , sometimes called fertilizer elements , are not usually available in large enough amount for best growth , most like they are added to soil by fertilization . The three primary macronutrients are as follows , except one:

    • Phosphorus
    • Calcium
    • Potassium
    • Nitrogen
    • None of the choices

We will be happy to hear your thoughts

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