Question 1

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

Accepted Answer

The answer of A community of organisms together with the...

Question 2

In marine ecosystems, net primary productivity tends to

Accepted Answer

A)  be greater along shorelines where terrestrial nutrients enter the marine environment. 
B)  be lower where the oceans border land because terrestrial pollution suppresses marine productivity. 
C)  be lowest in areas where upwelling brings colder water to the surface. 
D)  be greater than the net primary productivity on land. 
A)  be greater along shorelines where terrestrial nutrients enter the marine environment. 
B)  be lower where the oceans border land because terrestrial pollution suppresses marine productivity. 
C)  be lowest in areas where upwelling brings colder water to the surface. 
D)  be greater than the net primary productivity on land.

Question 3

Which of the following is the dominant type of organism in the two natural terrestrial ecosystems that have 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 4

The marine ecosystem with the lowest net primary productivity is

Accepted Answer

A)  the coral reef. 
B)  the open ocean. 
C)  swamp and marsh areas. 
D)  the ocean upwelling zone. 
A)  the coral reef. 
B)  the open ocean. 
C)  swamp and marsh areas. 
D)  the ocean upwelling zone.

Question 5

To best utilize the earth's NPP to feed the most people, diets should be modified to include _______ and gathering the maximum amount of energy available from a given biomass of producers.

Accepted Answer

A)  only meat, moving higher up the food chain, 
B)  only meat, moving lower down the food chain, 
C)  plant material only, moving lower down the food chain, 
D)  plant material only, moving higher up the food chain, 
A)  only meat, moving higher up the food chain, 
B)  only meat, moving lower down the food chain, 
C)  plant material only, moving lower down the food chain, 
D)  plant material only, moving higher up the food chain,

Question 6

Energy cannot be recycled.

Accepted Answer

A) True 
 B)False

Question 7

The energy in sunlight is directly associated with the synthesis of

Accepted Answer

A)  carbon dioxide. 
B)  sugars. 
C)  fats. 
D)  nucleic acids. 
A)  carbon dioxide. 
B)  sugars. 
C)  fats. 
D)  nucleic acids.

Question 8

Other than the polar tundra, the least productive biomes tend to be

Accepted Answer

A)  deserts. 
B)  the temperate forests. 
C)  the tropical forests. 
D)  estuaries. 
A)  deserts. 
B)  the temperate forests. 
C)  the tropical forests. 
D)  estuaries.

Question 9

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 10

The figure below illustrates how nutrients cycle between organic and inorganic reservoirs. Within each reservoir the nutrient may be available or unavailable for use.  
According to the figure above, what is the inorganic reservoir where phosphorus is unavailable?

Accepted Answer

A)  the atmosphere 
B)  the soil 
C)  ocean sediments 
D)  decomposers 
A)  the atmosphere 
B)  the soil 
C)  ocean sediments 
D)  decomposers

Question 11

In an ecosystem energy differs from nutrients in that

Accepted Answer

A)  energy is recycled through photosynthesis but nutrients are recycled through the atmosphere. 
B)  nutrients are recycled but energy eventually moves out of the system and is lost. 
C)  nutrients are recycled through plant roots but energy is recycled through leaves. 
D)  energy is recycled by producers but nutrients are recycled by consumers. 
A)  energy is recycled through photosynthesis but nutrients are recycled through the atmosphere. 
B)  nutrients are recycled but energy eventually moves out of the system and is lost. 
C)  nutrients are recycled through plant roots but energy is recycled through leaves. 
D)  energy is recycled by producers but nutrients are recycled by consumers.

Question 12

Approximately 100 percent of the energy captured from the sun is passed from trophic level to trophic level.

Accepted Answer

A) True 
 B)False

Question 13

On average, what percentage of the energy from one trophic level of an energy pyramid is transferred to the next trophic level?

Accepted Answer

A)  10 
B)  33 
C)  50 
D)  100 
A)  10 
B)  33 
C)  50 
D)  100

Question 14

In an ecosystem the assemblage of living organisms constitutes the _____ component.

Accepted Answer

The answer of In an ecosystem the assemblage of living...

Question 15

Over time the total amount of nutrients such as carbon and iron present on the earth increases 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 16

Rainfall naturally has a neutral pH.

Accepted Answer

A) True 
 B)False

Question 17

Once an organic molecule enters a metabolic pathway a significant percentage of its energy

Accepted Answer

A)  can be recycled through the ecosystem. 
B)  will be recovered and used by decomposers. 
C)  is lost as unrecoverable heat. 
D)  enters the nutrient cycle. 
A)  can be recycled through the ecosystem. 
B)  will be recovered and used by decomposers. 
C)  is lost as unrecoverable heat. 
D)  enters the nutrient cycle.

Question 18

The term ecosystem services is used to describe beneficial activities performed by healthy ecosystems, some examples include

Accepted Answer

A)  pollination of crops 
B)  flood control 
C)  filtering of pollutants from water 
D)  all of the above 
A)  pollination of crops 
B)  flood control 
C)  filtering of pollutants from water 
D)  all of the above

Question 19

Ecosystems are closed systems.

Accepted Answer

A) True 
 B)False

Question 20

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

Accepted Answer

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

Exam 37: Ecosystems

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

In marine ecosystems, net primary productivity tends to

Which of the following is the dominant type of organism in the two natural terrestrial ecosystems that have the greatest net primary productivity (NPP)?

The marine ecosystem with the lowest net primary productivity is

To best utilize the earth's NPP to feed the most people, diets should be modified to include _______ and gathering the maximum amount of energy available from a given biomass of producers.

Energy cannot be recycled.

The energy in sunlight is directly associated with the synthesis of

Other than the polar tundra, the least productive biomes tend to be

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

The figure below illustrates how nutrients cycle between organic and inorganic reservoirs. Within each reservoir the nutrient may be available or unavailable for use. According to the figure above, what is the inorganic reservoir where phosphorus is unavailable?

In an ecosystem energy differs from nutrients in that

Approximately 100 percent of the energy captured from the sun is passed from trophic level to trophic level.

On average, what percentage of the energy from one trophic level of an energy pyramid is transferred to the next trophic level?

In an ecosystem the assemblage of living organisms constitutes the _____ component.

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

Rainfall naturally has a neutral pH.

Once an organic molecule enters a metabolic pathway a significant percentage of its energy

The term ecosystem services is used to describe beneficial activities performed by healthy ecosystems, some examples include

Ecosystems are closed systems.

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

The Nature of Science and the Characteristics of Life

Organizing the Diversity of Life

Major Groups of Living Organisms

Chemical Building Blocks

Cell Structure and Internal Compartments

Cell Membranes, Transport, and Communication

Energy and Enzymes

Photosynthesis and Cellular Respiration

Cell Division

Patterns of Inheritance

Chromosomes and Human Genetics

DNA

From Gene to Protein

Control of Gene Expression

DNA Technology

How Evolution Works

Evolution of Populations

Adaptation and Speciation

The Evolutionary History of Life

Maintaining the Internal Environment

Animal Nutrition and Digestion

Gas Exchange

The Circulatory System

Animal Hormones

The Nervous System

Sensing the Environment

Skeletons, Muscles, and Movement

Defenses against Disease

Reproduction and Development

Animal Behavior

Plant Structure, Nutrition, and Transport

Plant Growth and Reproduction

The Biosphere

Growth of Populations

Interactions among Organisms

Communities of Organisms

Global Change

Biodiversity and People

Cancer: Cell Division Out of Control

Harnessing the Human Genome

Humans and Evolution

Smoking--Beyond Lung Cancer

Feeding a Hungry Planet

Building a Sustainable Society

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