SCSC 301 Final Exam with verified
answers
Which of the following is NOT considered to be a function of soil? - ANSWERS✔✔ а.
Regulate water supplies
b. Modify atmosphere
с. Medium for plant growth
d. Recycle raw materials
e. They are all functions and services of soil
D
A soil that supports plant life must provide ——to the roots of the plants. -
ANSWERS✔✔ Oxygen and Nutrients
A soil contains A, E, B, and C master horizons. The A, E, and B horizons are
considered - ANSWERS✔✔ Soil solum
Which master horizon is considered the horizon of accumulation (i.e., illuviation)? -
ANSWERS✔✔ B
Which master horizon is considered the horizon of eluviation? - ANSWERS✔✔ E
In an ideal surface soil (with good conditions for plant growth), the percent of air is
and the percent water is overall (considering both solid and pore spaces). -
ANSWERS✔✔ 25%, 25%
Which horizon is a mix of mineral and organic matter, generally porous, has high
amounts of biological activity and often has less clay? - ANSWERS✔✔ A
, Compared to the atmosphere, soil has a higher concentration of - ANSWERS✔✔
Carbon Dioxide (CO2)
Which of the following primary minerals is most resistant to weathering? -
ANSWERS✔✔ Quartz
Which element is more concentrated in soil than in rocks and it not an essential
nutrient for plants? - ANSWERS✔✔ Al (aluminum)
Primary minerals have chemical or no chemical alteration? - ANSWERS✔✔ have had
no chemical alteration
The specific term used to describe deposits of wind-blown silt-sized particles that
will serve as parent materials is - ANSWERS✔✔ Loess
Weathering is greatest in tropical humid or tropical arid - ANSWERS✔✔ Tropical
humid
Soils with alluvium parent materials are likely to form.. - ANSWERS✔✔ near rivers
and streams
Effective precipitation is greatest where - ANSWERS✔✔ at the base of a slope/valley
since water can enter soil from precipitation and from runoff
A reaction that separates H20 into OH and H* ions is called - ANSWERS✔✔
hydrolysis
Which type of chemical weathering involves the transfer of electrons from one
element/ion/compound to another? - ANSWERS✔✔ Redox
Which factor does not promote aggregation? - ANSWERS✔✔ Monovalent cation
activity from Na+
Soil compaction has no effect on what? - ANSWERS✔✔ soil texture
answers
Which of the following is NOT considered to be a function of soil? - ANSWERS✔✔ а.
Regulate water supplies
b. Modify atmosphere
с. Medium for plant growth
d. Recycle raw materials
e. They are all functions and services of soil
D
A soil that supports plant life must provide ——to the roots of the plants. -
ANSWERS✔✔ Oxygen and Nutrients
A soil contains A, E, B, and C master horizons. The A, E, and B horizons are
considered - ANSWERS✔✔ Soil solum
Which master horizon is considered the horizon of accumulation (i.e., illuviation)? -
ANSWERS✔✔ B
Which master horizon is considered the horizon of eluviation? - ANSWERS✔✔ E
In an ideal surface soil (with good conditions for plant growth), the percent of air is
and the percent water is overall (considering both solid and pore spaces). -
ANSWERS✔✔ 25%, 25%
Which horizon is a mix of mineral and organic matter, generally porous, has high
amounts of biological activity and often has less clay? - ANSWERS✔✔ A
, Compared to the atmosphere, soil has a higher concentration of - ANSWERS✔✔
Carbon Dioxide (CO2)
Which of the following primary minerals is most resistant to weathering? -
ANSWERS✔✔ Quartz
Which element is more concentrated in soil than in rocks and it not an essential
nutrient for plants? - ANSWERS✔✔ Al (aluminum)
Primary minerals have chemical or no chemical alteration? - ANSWERS✔✔ have had
no chemical alteration
The specific term used to describe deposits of wind-blown silt-sized particles that
will serve as parent materials is - ANSWERS✔✔ Loess
Weathering is greatest in tropical humid or tropical arid - ANSWERS✔✔ Tropical
humid
Soils with alluvium parent materials are likely to form.. - ANSWERS✔✔ near rivers
and streams
Effective precipitation is greatest where - ANSWERS✔✔ at the base of a slope/valley
since water can enter soil from precipitation and from runoff
A reaction that separates H20 into OH and H* ions is called - ANSWERS✔✔
hydrolysis
Which type of chemical weathering involves the transfer of electrons from one
element/ion/compound to another? - ANSWERS✔✔ Redox
Which factor does not promote aggregation? - ANSWERS✔✔ Monovalent cation
activity from Na+
Soil compaction has no effect on what? - ANSWERS✔✔ soil texture
