Question 1

Nitrogen fixation due to human activities now exceeds total global fixation by all other biotic and abiotic agents.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following gases contribute to warming of the Earth's surface through the greenhouse effect?

Accepted Answer

A)  carbon dioxide 
B)  methane 
C)  water vapor 
D)  nitrous oxide 
E)  All of the choices are correct. 
A)  carbon dioxide 
B)  methane 
C)  water vapor 
D)  nitrous oxide 
E)  All of the choices are correct.

Question 3

Ozone in the stratosphere is destroyed during breakdown of ________ molecules.

Accepted Answer

chlorofluo

Question 4

Which of the following make important contributions to nitrogen fixation by human activities?

Accepted Answer

A)  combustion of fossil fuels 
B)  industrial production of nitrogen fertilizers 
C)  use of crop rotation in agriculture 
D)  All of the choices are correct. 
E)  only industrial production of nitrogen fertilizers and use of crop rotation in agriculture 
A)  combustion of fossil fuels 
B)  industrial production of nitrogen fertilizers 
C)  use of crop rotation in agriculture 
D)  All of the choices are correct. 
E)  only industrial production of nitrogen fertilizers and use of crop rotation in agriculture

Question 5

Before life evolved on Earth,the atmosphere

Accepted Answer

A)  had much higher concentrations of oxygen. 
B)  had much lower concentrations of carbon dioxide. 
C)  was more or less the same as it is now. 
D)  had much lower concentrations of oxygen. 
E)  had much lower concentrations of hydrogen. 
A)  had much higher concentrations of oxygen. 
B)  had much lower concentrations of carbon dioxide. 
C)  was more or less the same as it is now. 
D)  had much lower concentrations of oxygen. 
E)  had much lower concentrations of hydrogen.

Question 6

Fur seals and sea lions in the Galápagos Islands experience population declines during El Niño events because

Accepted Answer

A)  their hibernation cues are disrupted by the unusual climate. 
B)  they are not capable of effective thermoregulation in the cooler waters around the islands. 
C)  the fish they feed upon move further offshore in search of warmer water. 
D)  the fish they feed upon move offshore and deeper in search of cooler water. 
E)  the fish they feed on are driven to local extinction. 
A)  their hibernation cues are disrupted by the unusual climate. 
B)  they are not capable of effective thermoregulation in the cooler waters around the islands. 
C)  the fish they feed upon move further offshore in search of warmer water. 
D)  the fish they feed upon move offshore and deeper in search of cooler water. 
E)  the fish they feed on are driven to local extinction.

Question 7

The nation containing the largest fraction of the world's tropical rain forest is

Accepted Answer

A)  Congo. 
B)  Brazil. 
C)  Mexico. 
D)  The United States. 
E)  Indonesia. 
A)  Congo. 
B)  Brazil. 
C)  Mexico. 
D)  The United States. 
E)  Indonesia.

Question 8

During El Niño events,primary production by phytoplankton increases sharply in the Great Salt Lake of Utah.This is because

Accepted Answer

A)  water temperatures increase. 
B)  nutrient concentrations are increased as lake volume shrinks. 
C)  decreasing salinity allows invasion of predators that control brine shrimp populations. 
D)  decreasing salinity allows invasion of more phytoplankton species. 
E)  decreasing dissolved oxygen increases the efficiency of photosynthesis. 
A)  water temperatures increase. 
B)  nutrient concentrations are increased as lake volume shrinks. 
C)  decreasing salinity allows invasion of predators that control brine shrimp populations. 
D)  decreasing salinity allows invasion of more phytoplankton species. 
E)  decreasing dissolved oxygen increases the efficiency of photosynthesis.

Question 9

The __________ is the layer of atmosphere which extends from the earth's surface to an altitude of 9 to 16 km.

Accepted Answer

A)  stratosphere 
B)  mesosphere 
C)  thermosphere 
D)  troposphere 
E)  ozonosphere 
A)  stratosphere 
B)  mesosphere 
C)  thermosphere 
D)  troposphere 
E)  ozonosphere

Nitrogen fixation due to human activities now exceeds total global fixation by all other biotic and abiotic agents.

Which of the following gases contribute to warming of the Earth's surface through the greenhouse effect?

Ozone in the stratosphere is destroyed during breakdown of ________ molecules.

Which of the following make important contributions to nitrogen fixation by human activities?

Before life evolved on Earth,the atmosphere

Fur seals and sea lions in the Galápagos Islands experience population declines during El Niño events because

The nation containing the largest fraction of the world's tropical rain forest is

During El Niño events,primary production by phytoplankton increases sharply in the Great Salt Lake of Utah.This is because

The __________ is the layer of atmosphere which extends from the earth's surface to an altitude of 9 to 16 km.

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

Socail 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

Nutrient Cycling and Retention

Succession and Stability

Landscape Ecology

Geographic Ecology

Filters

Exam 23: Global Ecology

Nitrogen fixation due to human activities now exceeds total global fixation by all other biotic and abiotic agents.

Which of the following gases contribute to warming of the Earth's surface through the greenhouse effect?

Ozone in the stratosphere is destroyed during breakdown of ________ molecules.

Which of the following make important contributions to nitrogen fixation by human activities?

Before life evolved on Earth,the atmosphere

Fur seals and sea lions in the Galápagos Islands experience population declines during El Niño events because

The nation containing the largest fraction of the world's tropical rain forest is

During El Niño events,primary production by phytoplankton increases sharply in the Great Salt Lake of Utah.This is because

The __________ is the layer of atmosphere which extends from the earth's surface to an altitude of 9 to 16 km.

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

Socail 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

Nutrient Cycling and Retention

Succession and Stability

Landscape Ecology

Geographic Ecology

Filters