Question 1

Wastes would accumulate and most nutrients would stop cycling if the ____ in the ecosystem died.

Accepted Answer

A)  protozoans and protistans 
B)  bacteria and fungi 
C)  flatworms, roundworms, and earthworms 
D)  insects 
E)  top carnivores 
A)  protozoans and protistans 
B)  bacteria and fungi 
C)  flatworms, roundworms, and earthworms 
D)  insects 
E)  top carnivores

Question 2

Feeding levels in an ecosystem are also known as

Accepted Answer

A)  nutritional levels. 
B)  nourishment levels. 
C)  trophic levels. 
D)  niche levels. 
E)  biome levels. 
A)  nutritional levels. 
B)  nourishment levels. 
C)  trophic levels. 
D)  niche levels. 
E)  biome levels.

Question 3

Plant cells assimilate nitrogen in the form of

Accepted Answer

A)  ammonia and N2. 
B)  N2 and nitrite. 
C)  nitrate and ammonia. 
D)  urea and nitrate. 
E)  uric acid. 
A)  ammonia and N2. 
B)  N2 and nitrite. 
C)  nitrate and ammonia. 
D)  urea and nitrate. 
E)  uric acid.

Question 4

In a natural community, the primary consumers are

Accepted Answer

A)  herbivores. 
B)  carnivores. 
C)  scavengers. 
D)  decomposers. 
E)  omnivores.. 
A)  herbivores. 
B)  carnivores. 
C)  scavengers. 
D)  decomposers. 
E)  omnivores..

Question 5

Net primary productivity is the

Accepted Answer

A)  rate of photosynthesis. 
B)  rate of energy flow. 
C)  amount of energy stored in the ecosystem. 
D)  amount of energy utilized. 
E)  amount of energy stored in the plant tissue in excess of that used by autotrophs in respiration. 
A)  rate of photosynthesis. 
B)  rate of energy flow. 
C)  amount of energy stored in the ecosystem. 
D)  amount of energy utilized. 
E)  amount of energy stored in the plant tissue in excess of that used by autotrophs in respiration.

Question 6

Which plants are planted to increase the amount of nitrogen in the soil?

Accepted Answer

A)  watermelon and cantaloupe vines 
B)  legumes 
C)  mints 
D)  grasses 
E)  heaths 
A)  watermelon and cantaloupe vines 
B)  legumes 
C)  mints 
D)  grasses 
E)  heaths

Question 7

The summer of 2008 brought the worst fire season in 50 years to California. The reason for this was

Accepted Answer

A)  very high temperatures. 
B)  an abnormally long summer season. 
C)  a series of dry winters. 
D)  a series of short winters. 
E)  a series of warm winters. 
A)  very high temperatures. 
B)  an abnormally long summer season. 
C)  a series of dry winters. 
D)  a series of short winters. 
E)  a series of warm winters.

Question 8

Most carbon dissolved in the ocean is in the form of

Accepted Answer

A)  carbon dioxide. 
B)  carbon monoxide. 
C)  carbonic acid. 
D)  bicarbonate and carbonate. 
E)  carbon tetrachloride. 
A)  carbon dioxide. 
B)  carbon monoxide. 
C)  carbonic acid. 
D)  bicarbonate and carbonate. 
E)  carbon tetrachloride.

Question 9

Which of the following is a primary consumer?

Accepted Answer

A)  cow 
B)  dog 
C)  hawk 
D)  fox 
E)  snake 
A)  cow 
B)  dog 
C)  hawk 
D)  fox 
E)  snake

Question 10

Materials in sedimentary cycles

Accepted Answer

A)  pass through both a solid and a gaseous phase. 
B)  are never present as gases in the ecosystem. 
C)  are present as liquids in the earth but as gases in the atmosphere. 
D)  pass through both a solid and a gaseous phase and are present as liquids in the earth but as gases in the atmosphere. 
E)  exist only in solid rocks. 
A)  pass through both a solid and a gaseous phase. 
B)  are never present as gases in the ecosystem. 
C)  are present as liquids in the earth but as gases in the atmosphere. 
D)  pass through both a solid and a gaseous phase and are present as liquids in the earth but as gases in the atmosphere. 
E)  exist only in solid rocks.

Question 11

The movement of phosphorus and other non-gaseous chemicals takes place in which cycle?

Accepted Answer

A)  global water cycle 
B)  atmospheric cycles 
C)  sedimentary cycles 
D)  solar-plant cycle 
E)  all of these 
A)  global water cycle 
B)  atmospheric cycles 
C)  sedimentary cycles 
D)  solar-plant cycle 
E)  all of these

Question 12

Primary carnivores are

Accepted Answer

A)  tertiary consumers in the third trophic level. 
B)  secondary consumers in the third trophic level. 
C)  secondary consumers in the second trophic level. 
D)  tertiary consumers in the fourth trophic level. 
E)  also primary producers. 
A)  tertiary consumers in the third trophic level. 
B)  secondary consumers in the third trophic level. 
C)  secondary consumers in the second trophic level. 
D)  tertiary consumers in the fourth trophic level. 
E)  also primary producers.

Question 13

Which of the following is NOT true of ecosystems?

Accepted Answer

A)  Although they may include many different species, many features of ecosystem structure and function are alike. 
B)  Autotrophs secure energy and nutrients that are then used by heterotrophs. 
C)  Energy cycles and minerals flow through ecosystems. 
D)  Many different niches are represented in most ecosystems. 
E)  Ecosystems are characterized by relatively few trophic levels. 
A)  Although they may include many different species, many features of ecosystem structure and function are alike. 
B)  Autotrophs secure energy and nutrients that are then used by heterotrophs. 
C)  Energy cycles and minerals flow through ecosystems. 
D)  Many different niches are represented in most ecosystems. 
E)  Ecosystems are characterized by relatively few trophic levels.

Question 14

The ultimate source of all energy in a terrestrial ecosystem is

Accepted Answer

A)  the organic matter in all the organisms of the ecosystem. 
B)  water. 
C)  sunlight. 
D)  carbon dioxide. 
E)  ATP. 
A)  the organic matter in all the organisms of the ecosystem. 
B)  water. 
C)  sunlight. 
D)  carbon dioxide. 
E)  ATP.

Question 15

Nitrifying bacteria convert

Accepted Answer

A)  ammonia to nitrite and nitrate. 
B)  nitrate to nitrite to nitrogen gas. 
C)  nitrate to ammonia. 
D)  urea to ammonia. 
E)  ammonia to urea. 
A)  ammonia to nitrite and nitrate. 
B)  nitrate to nitrite to nitrogen gas. 
C)  nitrate to ammonia. 
D)  urea to ammonia. 
E)  ammonia to urea.

Question 16

Match between columns
                        Premises: Most mushrooms function in this capacity.
A bear feeding on a salmon is functioning as this.
A Venus flytrap plant obtains its nitrogen when it functions as this.
This is a primary consumer.
A bear feeding on blueberries is functioning as this.

Accepted Answer

The Answer of decomposer and herbivore. and decomposer. and producer is...

Question 17

Nitrogen is released into the atmosphere by

Accepted Answer

A)  nitrogen fixation. 
B)  denitrification. 
C)  nitrification. 
D)  ammonification. 
E)  decomposition. 
A)  nitrogen fixation. 
B)  denitrification. 
C)  nitrification. 
D)  ammonification. 
E)  decomposition.

Question 18

Climate experts predict that in the mountains of western North America

Accepted Answer

A)  average temperatures will rise. 
B)  there will be less snow. 
C)  there will be drier forests. 
D)  there will be more intense wildfires. 
E)  all of these. 
A)  average temperatures will rise. 
B)  there will be less snow. 
C)  there will be drier forests. 
D)  there will be more intense wildfires. 
E)  all of these.

Question 19

Decomposers are represented by the letter ____.

Accepted Answer

The answer of   
 Decomposers are represented by...

Question 20

Match between columns
                        Premises: This is the process whereby gaseous nitrogen is first converted to ammonia and then to other nitrogenous compounds.
The action of bacteria on nitrates, converting them to gaseous nitrogen, occurs during this process.
The action of bacteria on urea occurs during this process.
The process whereby nitrite is converted to nitrate is an important part of this process.
The action of bacteria on ammonia, ultimately converting it to nitrate, occurs during this process.

Accepted Answer

The Answer of nitrogen fixation and nitrification. and ammonification and is...

Exam 24: Principles of Ecology

Wastes would accumulate and most nutrients would stop cycling if the ____ in the ecosystem died.

Feeding levels in an ecosystem are also known as

Plant cells assimilate nitrogen in the form of

In a natural community, the primary consumers are

Net primary productivity is the

Which plants are planted to increase the amount of nitrogen in the soil?

The summer of 2008 brought the worst fire season in 50 years to California. The reason for this was

Most carbon dissolved in the ocean is in the form of

Which of the following is a primary consumer?

Materials in sedimentary cycles

The movement of phosphorus and other non-gaseous chemicals takes place in which cycle?

Primary carnivores are

Which of the following is NOT true of ecosystems?

The ultimate source of all energy in a terrestrial ecosystem is

Nitrifying bacteria convert

Nitrogen is released into the atmosphere by

Climate experts predict that in the mountains of western North America

Decomposers are represented by the letter ____.

Learning About Human Biology

Chemistry of Life

Cells and How They Work

Tissues, Organs, and Organ Systems

The Skeletal System

The Muscular System

Circulation: the Heart and Blood Vessels

Blood

Immunity and Disease

The Respiratory System

Digestion and Nutrition

The Urinary System

The Nervous System

Sensory Systems

The Endocrine System

Reproductive Systems

Development and Aging

Cell Reproduction

Introduction to Genetics

Chromosomes and Human Genetics

DNA, Genes, and Biotechnology

Genes and Disease: Cancer

Principles of Evolution

Human Impacts on the Biosphere

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