Question 1

If a forested area surrounding a stream is cleared of trees, what has been found to happen?

Accepted Answer

A)   Increased import of nutrients to the soil
B)   Decreased rates of soil and rock weathering
C)   Increased run-off of water
D)   Decreased rates of chemical leaching
E)   Increased denitrificationF) D) and E)
G) B) and D)

Question 2

Which nutrient does not cycle globally?

Accepted Answer

A)   Carbon
B)   Water
C)   Nitrogen
D)   Phosphorus
E)   SulfurF) A) and E)
G) All of the above

Question 3

How does DDT in the environment affect many birds?

Accepted Answer

A)   It poisons them
B)   It causes chronic liver failure
C)   It causes egg shell thinning and breaking
D)   It reduces the number of prey
E)   It causes neurological degenerationF) B) and C)
G) A) and B) C

Question 4

The movement of chemicals through ecosystems occurs through

Accepted Answer

A)   Gross primary production
B)   Biogeochemical cycles
C)   Geobiochemical cycles
D)   Biomagnification
E)   Physiochemical cyclesF) All of the above
G) A) and B)

Question 5

DDT stands for

Accepted Answer

A)   Diethyldiphenyltrichloroethane
B)   Diethanedichlorotriethylmethane
C)   Dichlorodiphenyltrichloroethane
D)   Dibenzyldiethyltrimethylethane
E)   DiphenyldichlorotriethylmethaneF) B) and D)
G) D) and E) C

Question 6

Atmospheric carbon exhibits a turnover in ___ years.

Accepted Answer

A)   1-2
B)   3-4
C)   6-10
D)   10-20
E)   20-50F) A) and D)
G) B) and D)

Question 7

What follows nitrogen fixation in the nitrogen cycle?

Accepted Answer

A)   Nitrification
B)   Ammonification
C)   Assimilation
D)   Denitrification
E)   DecombustionF) C) and D)
G) A) and B)

Question 8

Ammonification is the conversion of ______________ to NH3 and NH4

Accepted Answer

A)   Living plant and animal matter
B)   Nitrites
C)   Inorganic nitrogen
D)   Nitrates
E)   Dead plant and animal matterF) A) and C)
G) D) and E) E

Question 9

The amount of carbon released into the atmosphere from soil respiration, by microbes, is about the same as the amount of carbon absorbed from the atmosphere by plants.

Accepted Answer

A) True 
 B)False

Question 10

Stiling and Drake conducted experiments about the effects, if any, of elevated CO2 on plant growth and insect herbivory. What did they find?

Accepted Answer

A)   Increased plant growth but no change in insect herbivory
B)   No change in plant growth but elevated insect herbivory
C)   Increased plant growth but reduced insect herbivory
D)   Increased plant growth and increased insect herbivory
E)   No change in either plant growth or insect herbivoryF) B) and C)
G) A) and E)

Exam 27: Biogeochemical Cycles

If a forested area surrounding a stream is cleared of trees, what has been found to happen?

Correct Answer
verified

Which nutrient does not cycle globally?

Correct Answer
verified

How does DDT in the environment affect many birds?

Correct Answer
verified
C

The movement of chemicals through ecosystems occurs through

Correct Answer
verified

DDT stands for

Correct Answer
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C

Atmospheric carbon exhibits a turnover in ___ years.

Correct Answer
verified

What follows nitrogen fixation in the nitrogen cycle?

Correct Answer
verified

Ammonification is the conversion of ______________ to NH₃ and NH₄

Correct Answer
verified
E

The amount of carbon released into the atmosphere from soil respiration, by microbes, is about the same as the amount of carbon absorbed from the atmosphere by plants.

Correct Answer
verified

Stiling and Drake conducted experiments about the effects, if any, of elevated CO₂ on plant growth and insect herbivory. What did they find?

Correct Answer
verified

Exam 27: Biogeochemical Cycles

If a forested area surrounding a stream is cleared of trees, what has been found to happen?

Correct AnswerverifiedShow Answer

Which nutrient does not cycle globally?

Correct AnswerverifiedShow Answer

How does DDT in the environment affect many birds?

Correct AnswerverifiedC

The movement of chemicals through ecosystems occurs through

Correct AnswerverifiedShow Answer

DDT stands for

Correct AnswerverifiedC

Atmospheric carbon exhibits a turnover in ___ years.

Correct AnswerverifiedShow Answer

What follows nitrogen fixation in the nitrogen cycle?

Correct AnswerverifiedShow Answer

Ammonification is the conversion of ______________ to NH3 and NH4

Correct AnswerverifiedE

The amount of carbon released into the atmosphere from soil respiration, by microbes, is about the same as the amount of carbon absorbed from the atmosphere by plants.

Correct AnswerverifiedShow Answer

Stiling and Drake conducted experiments about the effects, if any, of elevated CO2 on plant growth and insect herbivory. What did they find?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified
C

Correct Answer
verified

Correct Answer
verified

Ammonification is the conversion of ______________ to NH₃ and NH₄

Correct Answer
verified
E

Correct Answer
verified

Stiling and Drake conducted experiments about the effects, if any, of elevated CO₂ on plant growth and insect herbivory. What did they find?

Correct Answer
verified