WorksheetsAGRI 16 PRINCIPLES OF SOIL SCIENCE MIDTERM EXAMINATION
Total questions: 44
Worksheet time: 48mins
The vertical face of a pedon exposing its horizons from the surface to the parent material is called
Soil Pit
Soil Horizon
Soil Profile
Soil Pedon
The part of the soil body which is greatly influenced by biological activity or plant roots.
bedrock
atmosphere
pit
solum
Continuous (consolidated) hard or very hard bedrock
A Horizon
B Horizon
C Horizon
R Horizon
Mainly found in forested soils
A Horizon
B Horizon
C Horizon
E Horizon
Develops when materials are eluviated out of a zone in the soil
E Horizon
A Horizon
B Horizon
C horizon
Recognizable plant and animal parts
Sapric material
Hemic material
Fibric material
Composite material
Finely fragmented residues intermediately decomposed
Sapric material
Hemic material
Fibric material
Composite material
Highly decomposed, smooth, and amorphous residues
Sapric material
Hemic material
Fibric material
Composite material
Outside the zone of “pedogenesis” or soil development
A horizon
B horizon
C horizon
Soil’s layer to the earth’s surface
Soil tilth
Soil horizon
Soil particles
Soil texture
Mainly undecomposed plant parts
Oi
Oa
Oe
None of the above
The true soil corresponds to this horizon
C
AB
ABC
ABCD
Plowing or cultivation has a great impact on soil formation. Which horizon shows cultivation?
Bt
Ab
Ap
None of the above
Deposition of materials carried from an overlying layer
Illuviation
Eluviation
Elluviation
Iluviation
Identify the correct lowercase letter symbols of the detailed information about composition of soil horizon.
"Organic material which is highly decomposed "
(a)
Identify the correct lowercase letter symbols of the detailed information about composition of soil horizon.
"A water-logged (gleyed) layer "
(a)
Identify the correct lowercase letter symbols of the detailed information about composition of soil horizon.
"An accumulation of illuvial humus"
(a)
Identify the correct lowercase letter symbols of the detailed information about composition of soil horizon.
"An accumulation of calcium carbonate"
(a)
Identify the correct lowercase letter symbols of the detailed information about composition of soil horizon.
"An accumulation of gypsum"
(a)
Identify the correct lowercase letter symbols of the detailed information about composition of soil horizon.
"An accumulation of illuvial iron"
(a)
Topography/contour of the land. (4pts)
Footslope
Summit
Backslope
Shoulder
Alluvium
Gases found in the soil pores (3pts)
Carbon dioxide
Biogas
Oxygen
Helium
Nitrogen
Forces of physical weathering (2pts)
Crystal growth
Hydration
Unloading
Dissolution
Oxidation
Examples of C horizon (4pts)
Glacial till
Beach sands
Loess
Alluvium
Pedon
Classification of rocks based on the visual characteristics (2 pts)
Color
Alluvium
Glacial till
Texture
Footslope
Modified TRUE or FALSE. Write TRUE if the statement is correct and change the underlined words or phrase if otherwise.
Hans Jenny is a Russian pedologist, is given the credit for having been the first to publish a soil-forming factor equation.
(a)
Modified TRUE or FALSE. Write TRUE if the statement is correct and change the underlined words or phrase if otherwise.
Percolation is the removal of material in solution from the soil.
(a)
Modified TRUE or FALSE. Write TRUE if the statement is correct and change the underlined words or phrase if otherwise.
Hydration is a decomposition which involves the addition of water.
(a)
Modified TRUE or FALSE. Write TRUE if the statement is correct and change the underlined words or phrase if otherwise.
Illuviation is the removal of soil material in suspension from the layer or layers of a soil.
(a)
Modified TRUE or FALSE. Write TRUE if the statement is correct and change the underlined words or phrase if otherwise.
Material transported by and deposited on land surfaces from moving water is called colluvium.
(a)
What is the difference between calcite and dolomite? (3pts)
Define the following parent materials: 3pts each
1. Alluvium
2. Colluvium
Soil formation is a continuous process. Discuss the effects of the soil-forming factors to soil formation. (20pts)
The upper-most horizon of a soil is generally
enriched with organic matter, in varying states of
decomposition. Where does most of this organic
matter come from? (5pts)
Oxidation is the process of addition and combination of ________ to minerals.
Metamorphism is caused by (a) .
This is not an element of climate
Relief
Precipitation
Temperature
Sunshine
Roots grow into cracks and force cracks open
Chemical weathering
Biological weathering
Hydrolysis
Exfoliation
Removal of soluble products from the soil and greatly contributes to the development of another kind of soil
Oxidation
Transformation
Exfoliation
Leaching
Removal of overlying materials by erosion and results in the cracking of rocks as they are elevated towards earth’s surface
Crystal growth
Freezing
Unloading
Exfoliation
Soils with properties inherited from the parent material
Young soils
Mature soils
Old soils
Intensively weathered soils
The principal gases found in the soil air
N, P and S
N, O2, and CO
N2, O2 and CO2
N, CO2 and S
The highest gas composition of soil air
N
P
K
CO2
What is the influence of the differences or variations of temperature on rocks? (10pts)
