Question 1

Which of the following describes the ultimate disposition of most energy in an ecosystem?

Accepted Answer

A)  It is used to construct the bodies of decomposers. 
B)  It is trapped as fossil fuels when producers die and become fossilized. 
C)  It is continuously recycled back into the ecosystem. 
D)  It eventually returns to space in the form of heat. 
A)  It is used to construct the bodies of decomposers. 
B)  It is trapped as fossil fuels when producers die and become fossilized. 
C)  It is continuously recycled back into the ecosystem. 
D)  It eventually returns to space in the form of heat.

Question 2

In a typical nutrient cycle,nutrients are generally captured into the biotic portion of the cycle by the

Accepted Answer

A)  herbivores. 
B)  primary producers. 
C)  carnivores. 
D)  decomposers. 
A)  herbivores. 
B)  primary producers. 
C)  carnivores. 
D)  decomposers.

Question 3

To best use 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 4

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

Accepted Answer

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

Question 5

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 6

The imbalance of soil nutrients causing the hemlock population decline has been associated with ________ overpopulation.

Accepted Answer

A)  bird 
B)  tree 
C)  insect 
D)  deer 
A)  bird 
B)  tree 
C)  insect 
D)  deer

Question 7

Which of the following series best represents the energy flow in an ecosystem?

Accepted Answer

A)  sun à consumer à producer à heat 
B)  consumer à producer à decomposer à sun 
C)  producer à consumer à decomposer à sun 
D)  sun à producer à consumer à heat 
A)  sun à consumer à producer à heat 
B)  consumer à producer à decomposer à sun 
C)  producer à consumer à decomposer à sun 
D)  sun à producer à consumer à heat

Question 8

What best explains the low productivity of the open ocean?

Accepted Answer

A)  The open ocean lacks sufficient light to support photosynthesis. 
B)  Nutrients rapidly sink to depths that sunlight cannot reach. 
C)  The open ocean is actually very productive, but its primary producers are consumed as quickly as they grow. 
D)  These regions are typically too cool to support significant primary production. 
A)  The open ocean lacks sufficient light to support photosynthesis. 
B)  Nutrients rapidly sink to depths that sunlight cannot reach. 
C)  The open ocean is actually very productive, but its primary producers are consumed as quickly as they grow. 
D)  These regions are typically too cool to support significant primary production.

Question 9

The following figure shows the net primary productivity (NPP)in marine biomes around the world.
   One factor that influences the areas with >90 g/m² per year in the above diagram involving nutrient-rich layers being driven to the surface is ________.

Accepted Answer

The answer of The following figure shows the net primary...

Question 10

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

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

Pollutants from industrial areas may contain ________,which can react with water to produce airborne particles of acid.

Accepted Answer

A)  oxygen 
B)  carbon dioxide 
C)  sulfur dioxide 
D)  nitrate 
A)  oxygen 
B)  carbon dioxide 
C)  sulfur dioxide 
D)  nitrate

Question 13

The primary contribution of decomposers to an ecosystem occurs when they

Accepted Answer

A)  capture solar energy. 
B)  recycle nutrients sequestered in organisms back to the physical environment. 
C)  regulate the number of producers. 
D)  prevent consumer overpopulation. 
A)  capture solar energy. 
B)  recycle nutrients sequestered in organisms back to the physical environment. 
C)  regulate the number of producers. 
D)  prevent consumer overpopulation.

Question 14

Rainfall with a low pH is called ________.

Accepted Answer

The answer of Rainfall with a low pH is called...

Question 15

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 16

Phosphorus is the only major nutrient with a sedimentary cycle.

Accepted Answer

A) True 
 B)False

Question 17

Lightning converts atmospheric nitrogen (N₂)to nitrogen compounds that mix with the soil.This is the mechanism by which the majority of nitrogen enters the soil.

Accepted Answer

A) True 
 B)False

Question 18

Most human-caused environmental damage can be successfully reversed and natural habitats can be reconstructed.

Accepted Answer

A) True 
 B)False

Question 19

In the absence of ________,nutrient recycling within the ecosystem would completely stop.

Accepted Answer

A)  rocks 
B)  secondary consumers 
C)  decomposers 
D)  predators 
A)  rocks 
B)  secondary consumers 
C)  decomposers 
D)  predators

Question 20

Coral reefs and swamps are among Earth's most productive ecosystems.

Accepted Answer

A) True 
 B)False

Exam 24: Ecosystems

Which of the following describes the ultimate disposition of most energy in an ecosystem?

In a typical nutrient cycle,nutrients are generally captured into the biotic portion of the cycle by the

To best use 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.

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

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

The imbalance of soil nutrients causing the hemlock population decline has been associated with ________ overpopulation.

Which of the following series best represents the energy flow in an ecosystem?

What best explains the low productivity of the open ocean?

The following figure shows the net primary productivity (NPP)in marine biomes around the world. One factor that influences the areas with >90 g/m² per year in the above diagram involving nutrient-rich layers being driven to the surface is ________.

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,energy differs from nutrients in that

Pollutants from industrial areas may contain ________,which can react with water to produce airborne particles of acid.

The primary contribution of decomposers to an ecosystem occurs when they

Rainfall with a low pH is called ________.

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

Phosphorus is the only major nutrient with a sedimentary cycle.

Lightning converts atmospheric nitrogen (N₂)to nitrogen compounds that mix with the soil.This is the mechanism by which the majority of nitrogen enters the soil.

Most human-caused environmental damage can be successfully reversed and natural habitats can be reconstructed.

In the absence of ________,nutrient recycling within the ecosystem would completely stop.

Coral reefs and swamps are among Earth's most productive ecosystems.

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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