Test 3 CSES 2040 UPDATED ACTUAL Questions and CORRECT Answers

Test 3 CSES 2040 UPDATED ACTUAL
Questions and CORRECT Answers
Plants get most of their C from
A. silicate minerals
B. water

C. air atmosphere - CORRECT ANSWER -C


The atmospheric concentration of CO2 has been _________ since the Industrial Revolution.
A. increasing
B. decreasing

C. constant - CORRECT ANSWER -A


If the C:N ratio of an organic material is greater than 25, nitrogen __________ most likely will
take place.
A. mineralization
B. immobilization

C. first A then B - CORRECT ANSWER -B


If a soil has an organic carbon of 1%, the organic matter content will approximately be:
A. 1%
B. 1.72%
C. 5%

D. 10% - CORRECT ANSWER -B


Increasing soil organic matter and atmospheric CO2 have benefits for plants even though
increasing CO2 concentration is shown to increase atmospheric temperature. (T/F) - CORRECT
ANSWER - true

, Most nitrogen in soil is in organic form and its availability is affected by soil organic matter
mineralization. (T/F) - CORRECT ANSWER - true



Plants take up nitrogen as ammonium and nitrate. (T/F) - CORRECT ANSWER - true


Soil nitrogen is lost by:
A. mineralization
B. immobilization
C. denitrification

D. b and c - CORRECT ANSWER -D


Plants take soil sulfur in the form of:
A. iron sulphate
B. elemental sulfur
C. sulphate

D. sulfur dioxide - CORRECT ANSWER -C


Calcium and magnesium are essential plant nutrients that are usually applied to soil as:
A. acidifying minerals
B. liming materials
C. source of microbes

D. source of humus - CORRECT ANSWER -B


Soil microbes:
A. are heterotrophs
B. can cause diseases
C. are sources of antibiotics

D. all of the above - CORRECT ANSWER -D