CSES 2040 Test 3 - Questions With A+ Expert Solutions
The amount of CO2 that enters the air atmosphere annually is greater than
that leaves the pool and as the result the atmosphere CO2... Correct Answer
- has been increasing
During photosynthesis, green plants use _____ and _____ to make starch
(C6H12O6). Hence, increases in atmospheric CO2 is expected to increase
starch production. Correct Answer - CO2 and H2O
Soil contains almost ________ as much carbon as the vegetation and the
atmosphere combined. Correct Answer - Twice
As soil organic matter content increases, its density will: Correct Answer -
decrease
The microbial decomposition of organic compound to yield inorganic
molecules such as N, P, etc., is called: Correct Answer - Mineralization
Immobilization process will result in net __________ of soluble nutrients such as
N, P, etc., in the soil. Correct Answer - loss
A typical green plant contains ___________% carbon on oven-dry basis.
Correct Answer - 40
To avoid a nitrate depression period, the minimum amount of nitrogen (kg)
that must be added to an organic residue that contains 1500 kg of C and 30 kg
of N will be: Correct Answer - 30
The C:N ratio of a typical Ap or B soil horizon is approximately: Correct
Answer -
Describes the increased decomposition of a relatively stable soil humus under
enhanced microbial activity when fresh plant residue is added to a soil.
Correct Answer - Priming Effect
No till farming practices will __________organic carbon of surface (0-5 cm
depth) soil compared to plowed soil. Correct Answer - Increase
, If organic carbon content of a soil is 2.92%, its organic matter content will be
about: Correct Answer - 5.02
Long term application of manure to soil as demonstrated by the Rothamstead
(1850) in England and the Morrow plot (1875) of Illinois experiments will
____________ soil organic carbon. Correct Answer - Increase
Plants get their C as CO2 from: Correct Answer - The atmosphere
T or F: Nitrogen (N2) is an inert gas because it reacts with O2 and forms NH3
under normal conditions. Correct Answer - False
T or F: The world will run short of nitrogen since there is limited nitrogen
ores and no other natural reserve exists to replace it. Correct Answer -
False
T or F: Most of the nitrogen fertilizer applied to soil is taken up by plants as
NH4+ and NO3- and as the result, the fertilizer nitrogen use efficiency is in the
range of 90-100%. Correct Answer - False
Gain of nitrogen includes: Correct Answer - Lighting and mineralization
T or F: Many years application of ammonium nitrate fertilizer to soil will have
no impact on its pH under normal conditions Correct Answer - False
Excess application of ___________ will result in plant lodging but nitrogen
deficiency will cause chlorosis of older leaves. Correct Answer - Nitrogen
fertilizer
T or F: Phosphates/sulfates that are inner sphere bonded with Al/Fe at low
soil pH are easily exchangeable with other anions as opposed to the outer
sphere bonded. Correct Answer - False
Plants take up soil sulfur in the form of: Correct Answer - Sulfate
T or F: Nitrogen and sulfur cycles and forms are similar except that most
nitrogen reserves are in mineral form whereas sulfur reserve in the
atmosphere that contains about 78% SO2 by volume. Correct Answer -
False
The amount of CO2 that enters the air atmosphere annually is greater than
that leaves the pool and as the result the atmosphere CO2... Correct Answer
- has been increasing
During photosynthesis, green plants use _____ and _____ to make starch
(C6H12O6). Hence, increases in atmospheric CO2 is expected to increase
starch production. Correct Answer - CO2 and H2O
Soil contains almost ________ as much carbon as the vegetation and the
atmosphere combined. Correct Answer - Twice
As soil organic matter content increases, its density will: Correct Answer -
decrease
The microbial decomposition of organic compound to yield inorganic
molecules such as N, P, etc., is called: Correct Answer - Mineralization
Immobilization process will result in net __________ of soluble nutrients such as
N, P, etc., in the soil. Correct Answer - loss
A typical green plant contains ___________% carbon on oven-dry basis.
Correct Answer - 40
To avoid a nitrate depression period, the minimum amount of nitrogen (kg)
that must be added to an organic residue that contains 1500 kg of C and 30 kg
of N will be: Correct Answer - 30
The C:N ratio of a typical Ap or B soil horizon is approximately: Correct
Answer -
Describes the increased decomposition of a relatively stable soil humus under
enhanced microbial activity when fresh plant residue is added to a soil.
Correct Answer - Priming Effect
No till farming practices will __________organic carbon of surface (0-5 cm
depth) soil compared to plowed soil. Correct Answer - Increase
, If organic carbon content of a soil is 2.92%, its organic matter content will be
about: Correct Answer - 5.02
Long term application of manure to soil as demonstrated by the Rothamstead
(1850) in England and the Morrow plot (1875) of Illinois experiments will
____________ soil organic carbon. Correct Answer - Increase
Plants get their C as CO2 from: Correct Answer - The atmosphere
T or F: Nitrogen (N2) is an inert gas because it reacts with O2 and forms NH3
under normal conditions. Correct Answer - False
T or F: The world will run short of nitrogen since there is limited nitrogen
ores and no other natural reserve exists to replace it. Correct Answer -
False
T or F: Most of the nitrogen fertilizer applied to soil is taken up by plants as
NH4+ and NO3- and as the result, the fertilizer nitrogen use efficiency is in the
range of 90-100%. Correct Answer - False
Gain of nitrogen includes: Correct Answer - Lighting and mineralization
T or F: Many years application of ammonium nitrate fertilizer to soil will have
no impact on its pH under normal conditions Correct Answer - False
Excess application of ___________ will result in plant lodging but nitrogen
deficiency will cause chlorosis of older leaves. Correct Answer - Nitrogen
fertilizer
T or F: Phosphates/sulfates that are inner sphere bonded with Al/Fe at low
soil pH are easily exchangeable with other anions as opposed to the outer
sphere bonded. Correct Answer - False
Plants take up soil sulfur in the form of: Correct Answer - Sulfate
T or F: Nitrogen and sulfur cycles and forms are similar except that most
nitrogen reserves are in mineral form whereas sulfur reserve in the
atmosphere that contains about 78% SO2 by volume. Correct Answer -
False
