Question 1

In open-water ecosystems,turnover prevents the movement of nutrients between the bottom and surface layers.

Accepted Answer

A) True 
 B)False

Question 2

The salt marsh system is dominated by

Accepted Answer

A)  carnivores.
B)  herbivores.
C)  secondary consumers.
D)  decomposers.

Question 3

In salt marshes,only a small portion of primary production is consumed by herbivores.

Accepted Answer

A) True 
 B)False

Question 4

Litter degrades into a dark brown or black homogeneous organic matter known as ________.

Accepted Answer

The answer of Litter degrades into a dark brown or...

Question 5

A C/N ratio of 134:1 will usually lead to immobilization.

Accepted Answer

A) True 
 B)False

Question 6

The rate of nutrient cycling in an ecosystem

Accepted Answer

A)  depends only on the rate of photosynthesis.
B)  depends only on the rate of decomposition.
C)  does not depend on the rate of photosynthesis or the rate of decomposition.
D)  depends on both the rate of photosynthesis and the rate of decomposition.

Question 7

In an estuary,the zone of maximum vertical difference in density of water layers is called the

Accepted Answer

A)  thermocline.
B)  pycnocline.
C)  mixing zone.
D)  hypolimnion.

Question 8

Which of the following are decomposers?

Accepted Answer

A)  mushrooms
B)  mites
C)  millipedes
D)  all of the above

Question 9

Which of the following is a zone of decomposition?

Accepted Answer

A)  forest canopy
B)  photic zone
C)  forest floor
D)  kelp forest

Question 10

Estuaries receive nutrients both from tides and from streams and rivers.

Accepted Answer

A) True 
 B)False

Question 11

Why does the C/N ratio decline over time?

Accepted Answer

A)  Mass increases over time.
B)  Mass is converted into microbes over time.
C)  Mass is converted into plants over time.
D)  More carbon is introduced into the system.

Question 12

The rate of net primary productivity can be limited directly by the availability of

Accepted Answer

A)  organic nutrients in the soil solution.
B)  inorganic nutrients in the soil solution.
C)  organic carbon in the soil solution.
D)  inorganic carbon in the soil solution.

Question 13

Why do areas with high NPP typically have a high rate of nutrient cycling?

Accepted Answer

A)  High amounts of productivity increase the number of decomposers.
B)  High amounts of productivity increase water production.
C)  High amounts of productivity cause low net mineralization rates.
D)  High amounts of productivity use low amounts of nutrients.

Question 14

The breakdown of chemical bonds that were formed during the construction of plant and animal tissues is called ________.

Accepted Answer

The answer of The breakdown of chemical bonds that were...

Question 15

The process of conversion of nutrients from an organic form into an inorganic form that plants can use is called

Accepted Answer

A)  immobilization.
B)  respiration.
C)  transpiration.
D)  mineralization.

Question 16

Animals that feed on bacteria and fungi are called ________.

Accepted Answer

The answer of Animals that feed on bacteria and fungi...

Question 17

Decomposers are primarily autotrophs.

Accepted Answer

A) True 
 B)False

Question 18

In an estuary,the zone of maximum vertical difference in density is called a(n)________.

Accepted Answer

The answer of In an estuary,the zone of maximum vertical...

Question 19

Which of the following are considered decomposer mesofauna?

Accepted Answer

A)  bacteria
B)  earthworms
C)  millipedes
D)  mites

Question 20

Which of the following variables is the coefficient that estimates decomposition rate?

Accepted Answer

A)  e
B)  k
C)  t
D)  d

Exam 21: Decomposition and Nutrient Cycling

Which of the following is a zone of decomposition?

Correct AnswerverifiedShow Answer

Estuaries receive nutrients both from tides and from streams and rivers.

Correct AnswerverifiedShow Answer

Why do areas with high NPP typically have a high rate of nutrient cycling?

Correct AnswerverifiedShow Answer

The rate of nutrient cycling in an ecosystem

Correct AnswerverifiedShow Answer

Litter degrades into a dark brown or black homogeneous organic matter known as ________.

Correct AnswerverifiedShow Answer

Which of the following are decomposers?

Correct AnswerverifiedShow Answer

The process of conversion of nutrients from an organic form into an inorganic form that plants can use is called

Correct AnswerverifiedShow Answer

Animals that feed on bacteria and fungi are called ________.

Correct AnswerverifiedShow Answer

The salt marsh system is dominated by

Correct AnswerverifiedShow Answer

In an estuary,the zone of maximum vertical difference in density of water layers is called the

Correct AnswerverifiedShow Answer

In an estuary,the zone of maximum vertical difference in density is called a(n)________.

Correct AnswerverifiedShow Answer

In salt marshes,only a small portion of primary production is consumed by herbivores.

Correct AnswerverifiedShow Answer

In open-water ecosystems,turnover prevents the movement of nutrients between the bottom and surface layers.

Correct AnswerverifiedShow Answer

A C/N ratio of 134:1 will usually lead to immobilization.

Correct AnswerverifiedShow Answer

Decomposers are primarily autotrophs.

Correct AnswerverifiedShow Answer

Which of the following are considered decomposer mesofauna?

Correct AnswerverifiedShow Answer

Which of the following variables is the coefficient that estimates decomposition rate?

Correct AnswerverifiedShow Answer

Why does the C/N ratio decline over time?

Correct AnswerverifiedShow Answer

The rate of net primary productivity can be limited directly by the availability of

Correct AnswerverifiedShow Answer

The breakdown of chemical bonds that were formed during the construction of plant and animal tissues is called ________.

Correct AnswerverifiedShow Answer

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