CSES 2040 Test 3 - Questions With Focused 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 has been increasing.
Correct Answer - True
During photosynthesis, green plants use CO2 and H2O to make starch
(C6H12O6). Hence, increases in atmospheric CO2 is expected to increase
starch production. Correct Answer - True
Soil contains almost twice as much carbon as the vegetation and the
atmosphere combined. Correct Answer - True
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 at
N, P, etc., in the soil. Correct Answer - Loss
A typical green plant contains ______% carbon on oven-dry basis. Correct
Answer - 40
To avoid 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 - None of the above (opposed to 1:10, 1:1, 100:1)
Priming effect 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 - True
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
Nitrogen (N2) is an inert gas because it reacts with O2 and forms NH3 under
normal conditions. Correct Answer - False
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
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 does not include: Correct Answer - NH3 volatilizaiton
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 nitrogen fertilizer will result in plant lodging but
nitrogen deficiency will cause chlorosis of older leaves. Correct Answer -
True
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 (SO4-2)
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 has been increasing.
Correct Answer - True
During photosynthesis, green plants use CO2 and H2O to make starch
(C6H12O6). Hence, increases in atmospheric CO2 is expected to increase
starch production. Correct Answer - True
Soil contains almost twice as much carbon as the vegetation and the
atmosphere combined. Correct Answer - True
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 at
N, P, etc., in the soil. Correct Answer - Loss
A typical green plant contains ______% carbon on oven-dry basis. Correct
Answer - 40
To avoid 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 - None of the above (opposed to 1:10, 1:1, 100:1)
Priming effect 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 - True
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
Nitrogen (N2) is an inert gas because it reacts with O2 and forms NH3 under
normal conditions. Correct Answer - False
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
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 does not include: Correct Answer - NH3 volatilizaiton
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 nitrogen fertilizer will result in plant lodging but
nitrogen deficiency will cause chlorosis of older leaves. Correct Answer -
True
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 (SO4-2)
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
