Question 1

With respect to the following values,rain with a pH of ________ would be the most acidic.

Accepted Answer

A)  7 
B)  3 
C)  8 
D)  5 
A)  7 
B)  3 
C)  8 
D)  5 B

Question 2

A community of organisms,together with the chemical and physical environment in which the organisms live,is known as a(n)________.

Accepted Answer

ecosystem

Question 3

________,caused by algal blooms triggered by excess nutrients in a lake,can result from excess decomposition followed by animals dying due to lack of oxygen.

Accepted Answer

Eutrophication

Question 4

Over time,the total amount of nutrients such as carbon and iron present on the Earth increases slightly by their addition from

Accepted Answer

A)  meteoric matter from space. 
B)  volcanic activity. 
C)  nutrient recycling. 
D)  electromagnetic radiation. 
A)  meteoric matter from space. 
B)  volcanic activity. 
C)  nutrient recycling. 
D)  electromagnetic radiation.

Question 5

Which of the following is the dominant type of organism in a natural terrestrial ecosystem that has the greatest net primary productivity (NPP)?

Accepted Answer

A)  grass 
B)  trees 
C)  food crops 
D)  fish 
A)  grass 
B)  trees 
C)  food crops 
D)  fish

Question 6

Which of the following statements best describes the impact of human activities on the cycling of nutrients in natural systems?

Accepted Answer

A)  Human activities are essentially benign and have little lasting impact on either atmospheric or sedimentary nutrient cycling. 
B)  Human activities have profoundly affected nutrient cycling, particularly with those nutrients that cycle within the atmosphere. 
C)  Human activities such as mining, construction, and road building disrupt the Earth's surface and greatly decrease those nutrients with sedimentary cycling pathways. 
D)  Human activities in general significantly enhance nutrient availability and are almost always associated with ecosystem improvements. 
A)  Human activities are essentially benign and have little lasting impact on either atmospheric or sedimentary nutrient cycling. 
B)  Human activities have profoundly affected nutrient cycling, particularly with those nutrients that cycle within the atmosphere. 
C)  Human activities such as mining, construction, and road building disrupt the Earth's surface and greatly decrease those nutrients with sedimentary cycling pathways. 
D)  Human activities in general significantly enhance nutrient availability and are almost always associated with ecosystem improvements.

Question 7

Net primary productivity on land

Accepted Answer

A)  tends to increase from the equator toward the poles. 
B)  tends to decrease from the equator toward the poles. 
C)  is greatest in deserts due to intense sunlight. 
D)  is very low in tropical areas due to excessive rainfall. 
A)  tends to increase from the equator toward the poles. 
B)  tends to decrease from the equator toward the poles. 
C)  is greatest in deserts due to intense sunlight. 
D)  is very low in tropical areas due to excessive rainfall.

Question 8

Cougars defend a relatively large territory; consider the following facts and estimate how much area a cougar would require: A cougar requires 490 kg annually and obtains most of its food from deer,which average 55 kg.In a typical deer habitat,the NPP is 35 kg per acre.One deer consumes approximately 1,150 kg of vegetation each year.

Accepted Answer

A)  300 acres 
B)  1,925 acres 
C)  3,000 acres 
D)  4,500 acres 
A)  300 acres 
B)  1,925 acres 
C)  3,000 acres 
D)  4,500 acres

Question 9

A nutrient whose biogeochemical cycle does not include an atmospheric phase is said to have a(n)________ cycle.

Accepted Answer

The answer of A nutrient whose biogeochemical cycle does not...

Question 10

Energy cannot be recycled.

Accepted Answer

A) True 
 B)False

Question 11

Net primary productivity in a terrarium could be estimated by

Accepted Answer

A)  carefully controlling the amount of light entering it. 
B)  counting the change in the number of plant species in it. 
C)  weighing the terrarium at regular intervals. 
D)  removing the primary consumers and weighing them at regular intervals. 
A)  carefully controlling the amount of light entering it. 
B)  counting the change in the number of plant species in it. 
C)  weighing the terrarium at regular intervals. 
D)  removing the primary consumers and weighing them at regular intervals.

Question 12

Rainfall naturally has a neutral pH.

Accepted Answer

A) True 
 B)False

Question 13

Some biologically important substances are transferred between organisms and the physical environment in a cyclical pattern called a ________ cycle.

Accepted Answer

The answer of Some biologically important substances are transferred between...

Question 14

Rainfall in some areas of Canada has a high acidity level and a correspondingly high pH.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following statements about cycling within an ecosystem is FALSE?

Accepted Answer

A)  Energy flows in two directions in an ecosystem. 
B)  Carbon is recycled within an ecosystem. 
C)  The sedimentary nutrient cycle cycles nutrients very slowly. 
D)  Human activities affect nutrient cycling. 
A)  Energy flows in two directions in an ecosystem. 
B)  Carbon is recycled within an ecosystem. 
C)  The sedimentary nutrient cycle cycles nutrients very slowly. 
D)  Human activities affect nutrient cycling.

Question 16

Eutrophication can eventually lead to

Accepted Answer

A)  an ecosystem that attracts many species. 
B)  a rapid decrease in algal populations. 
C)  an increase in dissolved oxygen in a water ecosystem. 
D)  a decrease in dissolved oxygen in a water ecosystem. 
A)  an ecosystem that attracts many species. 
B)  a rapid decrease in algal populations. 
C)  an increase in dissolved oxygen in a water ecosystem. 
D)  a decrease in dissolved oxygen in a water ecosystem.

Question 17

All areas of the same landmass have the same net primary productivity.

Accepted Answer

A) True 
 B)False

Question 18

Human actions such as logging,building on a floodplain,or diverting rivers increase the probability of severe ________.

Accepted Answer

The answer of Human actions such as logging,building on a...

Question 19

Ecosystems are closed systems.

Accepted Answer

A) True 
 B)False

Question 20

The physical,chemical,and biological processes that link the biotic and abiotic worlds in an ecosystem are known as

Accepted Answer

A)  ecosystem processes. 
B)  primary production events. 
C)  energy pyramids. 
D)  biogeochemical fixation. 
A)  ecosystem processes. 
B)  primary production events. 
C)  energy pyramids. 
D)  biogeochemical fixation.

Exam 24: Ecosystems

With respect to the following values,rain with a pH of ________ would be the most acidic.

A community of organisms,together with the chemical and physical environment in which the organisms live,is known as a(n)________.

________,caused by algal blooms triggered by excess nutrients in a lake,can result from excess decomposition followed by animals dying due to lack of oxygen.

Over time,the total amount of nutrients such as carbon and iron present on the Earth increases slightly by their addition from

Which of the following is the dominant type of organism in a natural terrestrial ecosystem that has the greatest net primary productivity (NPP)?

Which of the following statements best describes the impact of human activities on the cycling of nutrients in natural systems?

Net primary productivity on land

A nutrient whose biogeochemical cycle does not include an atmospheric phase is said to have a(n)________ cycle.

Energy cannot be recycled.

Net primary productivity in a terrarium could be estimated by

Rainfall naturally has a neutral pH.

Some biologically important substances are transferred between organisms and the physical environment in a cyclical pattern called a ________ cycle.

Rainfall in some areas of Canada has a high acidity level and a correspondingly high pH.

Which of the following statements about cycling within an ecosystem is FALSE?

Eutrophication can eventually lead to

All areas of the same landmass have the same net primary productivity.

Human actions such as logging,building on a floodplain,or diverting rivers increase the probability of severe ________.

Ecosystems are closed systems.

The physical,chemical,and biological processes that link the biotic and abiotic worlds in an ecosystem are known as

The Nature of Science and the Characteristics of Life

The Chemistry of Life

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy, Metabolism, and Enzymes

Photo Synthesis and Cellular Respiration

Cell Division

Cancer and Human Health

Patterns of Inheritance

Chromosomes and Human Genetics

DNA and Genes

From Gene to Protein

DNA Technology

How Evolution Works

The Origin of Species

The Evolution of Biodiversity

Biological Diversity, Bacteria, and Archaea

Protista, Plantae, and Fungi

Animalia

The Biosphere

Growth of Populations

Animal Behavior

Ecological Communities

Global Change

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