Question 1

Likens and Bormann found that over 90% of the nutrients in the Hubbard Brook Experimental Forest were in the soil organic matter.

Accepted Answer

A) True 
 B)False

Question 2

The end product of biological nitrogen fixation is

Accepted Answer

A) N2. 
B) NO3-. 
C) NO2-. 
D) NH3. 
E) None of the choices are correct. 
A) N2. 
B) NO3-. 
C) NO2-. 
D) NH3. 
E) None of the choices are correct.

Question 3

In aquatic ecosystems,the major agents of decomposition are

Accepted Answer

A) aquatic fungi. 
B) bacteria. 
C) algae. 
D) detritivorous fish. 
E) piscivorous fish. 
A) aquatic fungi. 
B) bacteria. 
C) algae. 
D) detritivorous fish. 
E) piscivorous fish.

Question 4

Plants in low nutrient ecosystems tend to

Accepted Answer

A) grow slowly and allocate more resources to shoots than roots. 
B) grow rapidly and allocate more resources to shoots than roots. 
C) grow rapidly and allocate more resources to roots than shoots. 
D) grow slowly and allocate more resources to roots than shoots. 
E) grow rapidly and allocate equal resources to roots and shoots. 
A) grow slowly and allocate more resources to shoots than roots. 
B) grow rapidly and allocate more resources to shoots than roots. 
C) grow rapidly and allocate more resources to roots than shoots. 
D) grow slowly and allocate more resources to roots than shoots. 
E) grow rapidly and allocate equal resources to roots and shoots.

Question 5

________________ is the process of increased nutrient inputs into an ecosystem resulting in increased primary productivity and reduced biodiversity.

Accepted Answer

The answer of ________________ is the process of increased nutrient...

Question 6

Fungi and bacteria release nitrogen stored in dead tissue through a decomposition process called

Accepted Answer

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

Question 7

High soil nutrient content usually leads to slower decomposition,because soil organisms have less need for nutrients of organic origin.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following is NOT an agent of nitrogen fixation?

Accepted Answer

A) mycorrhizal fungi 
B) cyanobacteria (blue-green algae) 
C) bacteria associated with legume roots 
D) lightning 
E) actinomycete bacteria associated with alder roots 
A) mycorrhizal fungi 
B) cyanobacteria (blue-green algae) 
C) bacteria associated with legume roots 
D) lightning 
E) actinomycete bacteria associated with alder roots

Question 9

The largest reservoir of phosphorus in most ecosystems is phosphorus

Accepted Answer

A) in the atmosphere. 
B) dissolved in water. 
C) in rocks and sediments. 
D) bound in animal tissues. 
E) bound in plant tissues. 
A) in the atmosphere. 
B) dissolved in water. 
C) in rocks and sediments. 
D) bound in animal tissues. 
E) bound in plant tissues.

Question 10

"Nitrogen fixation" refers to the conversion of

Accepted Answer

A) carbon compounds to nitrogen compounds. 
B) nitrogen gas (N2)to ammonia (NH2). 
C) ammonia (NH3)to nitrogen gas (N2). 
D) ammonium (NH4+)to nitrate (NO3-). 
E) ammonium (NH4+)to nitrite (NO2-). 
A) carbon compounds to nitrogen compounds. 
B) nitrogen gas (N2)to ammonia (NH2). 
C) ammonia (NH3)to nitrogen gas (N2). 
D) ammonium (NH4+)to nitrate (NO3-). 
E) ammonium (NH4+)to nitrite (NO2-).

Question 11

The "denitrification" reaction converts nitrate (NO3-)to nitrogen gas (N2)under aerobic conditions.

Accepted Answer

A) True 
 B)False

Question 12

Phosphorus is an important constituent of

Accepted Answer

A) DNA. 
B) bone tissue. 
C) RNA. 
D) ATP. 
E) All of the choices are correct. 
A) DNA. 
B) bone tissue. 
C) RNA. 
D) ATP. 
E) All of the choices are correct.

Question 13

Which of the following are nitrogen fixing organisms?

Accepted Answer

A) cyanobacteria 
B) leguminous plants 
C) alders 
D) All of the choices are correct. 
E) both cyanobacteria and leguminous plants 
A) cyanobacteria 
B) leguminous plants 
C) alders 
D) All of the choices are correct. 
E) both cyanobacteria and leguminous plants

Question 14

The release of nutrients from organic material in inorganic form is called _____________.

Accepted Answer

The answer of The release of nutrients from organic material...

Question 15

"Nitrification" is the conversion of

Accepted Answer

A) carbon compounds to nitrogen compounds. 
B) nitrogen gas (N2)to ammonia (NH2). 
C) ammonium (NH4+)to nitrate (NO3-). 
D) ammonia (NH3)to nitrogen gas (N2). 
E) ammonium (NH4+)to nitrite (NO2-). 
A) carbon compounds to nitrogen compounds. 
B) nitrogen gas (N2)to ammonia (NH2). 
C) ammonium (NH4+)to nitrate (NO3-). 
D) ammonia (NH3)to nitrogen gas (N2). 
E) ammonium (NH4+)to nitrite (NO2-).

Question 16

Clearcutting at Hubbard Brook Experimental Forest sharply

Accepted Answer

A) increased export of nitrate (NO3-)in stream water. 
B) decreased export of nitrate (NO3-)in stream water. 
C) increased rates of denitrification in soils. 
D) decreased deposition of ammonia (NH3)from the atmosphere. 
E) increased deposition of ammonia (NH3)from the atmosphere. 
A) increased export of nitrate (NO3-)in stream water. 
B) decreased export of nitrate (NO3-)in stream water. 
C) increased rates of denitrification in soils. 
D) decreased deposition of ammonia (NH3)from the atmosphere. 
E) increased deposition of ammonia (NH3)from the atmosphere.

Likens and Bormann found that over 90% of the nutrients in the Hubbard Brook Experimental Forest were in the soil organic matter.

The end product of biological nitrogen fixation is

In aquatic ecosystems,the major agents of decomposition are

Plants in low nutrient ecosystems tend to

________________ is the process of increased nutrient inputs into an ecosystem resulting in increased primary productivity and reduced biodiversity.

Fungi and bacteria release nitrogen stored in dead tissue through a decomposition process called

High soil nutrient content usually leads to slower decomposition,because soil organisms have less need for nutrients of organic origin.

Which of the following is NOT an agent of nitrogen fixation?

The largest reservoir of phosphorus in most ecosystems is phosphorus

"Nitrogen fixation" refers to the conversion of

The "denitrification" reaction converts nitrate (NO₃^-)to nitrogen gas (N₂)under aerobic conditions.

Phosphorus is an important constituent of

Which of the following are nitrogen fixing organisms?

The release of nutrients from organic material in inorganic form is called _____________.

"Nitrification" is the conversion of

Clearcutting at Hubbard Brook Experimental Forest sharply

Introduction to Ecology: Historical Foundations and Developing Frontiers

Life on Land

Life in Water

Population Genetics and Natural Selection

Temperature Relations

Water Relations

Energy and Nutrient Relations

Social Relations

Population Distribution and Abundance

Population Dynamics

Population Growth

Life Histories

Competition

Exploitative Interactions: Predation, herbivory, parasitism, and Disease

Mutualism

Species Abundance and Diversity

Species Interactions and Community Structure

Primary Production and Energy Flow

Succession and Stability

Landscape Ecology

Geographic Ecology

Global Ecology

Filters

Exam 19: Nutrient Cycling and Retention

Likens and Bormann found that over 90% of the nutrients in the Hubbard Brook Experimental Forest were in the soil organic matter.

The end product of biological nitrogen fixation is

In aquatic ecosystems,the major agents of decomposition are

Plants in low nutrient ecosystems tend to

________________ is the process of increased nutrient inputs into an ecosystem resulting in increased primary productivity and reduced biodiversity.

Fungi and bacteria release nitrogen stored in dead tissue through a decomposition process called

High soil nutrient content usually leads to slower decomposition,because soil organisms have less need for nutrients of organic origin.

Which of the following is NOT an agent of nitrogen fixation?

The largest reservoir of phosphorus in most ecosystems is phosphorus

"Nitrogen fixation" refers to the conversion of

The "denitrification" reaction converts nitrate (NO3-)to nitrogen gas (N2)under aerobic conditions.

Phosphorus is an important constituent of

Which of the following are nitrogen fixing organisms?

The release of nutrients from organic material in inorganic form is called _____________.

"Nitrification" is the conversion of

Clearcutting at Hubbard Brook Experimental Forest sharply

Introduction to Ecology: Historical Foundations and Developing Frontiers

Life on Land

Life in Water

Population Genetics and Natural Selection

Temperature Relations

Water Relations

Energy and Nutrient Relations

Social Relations

Population Distribution and Abundance

Population Dynamics

Population Growth

Life Histories

Competition

Exploitative Interactions: Predation, herbivory, parasitism, and Disease

Mutualism

Species Abundance and Diversity

Species Interactions and Community Structure

Primary Production and Energy Flow

Succession and Stability

Landscape Ecology

Geographic Ecology

Global Ecology

Filters

The "denitrification" reaction converts nitrate (NO₃^-)to nitrogen gas (N₂)under aerobic conditions.