Question 1

If decomposers did not exist,the flow of nutrients would cease and the food chain would collapse.

Accepted Answer

A) True 
 B)False

Question 2

Which of the following life-zone lists is in the correct sequence from lowest to highest elevation?

Accepted Answer

A) tropical rain forest,needleleaf forest,temperate deciduous forest,ice and snow,tundra 
B) tundra,tropical rain forest,needleleaf forest,temperate deciduous forest,ice and snow 
C) temperate deciduous forest,tropical rain forest,needleleaf forest,ice and snow,tundra 
D) tropical rain forest,temperate deciduous forest,needleleaf forest,tundra,and ice and snow 
E) temperate deciduous forest,tundra,needleleaf forest,tropical rain forest,ice and snow. 
A) tropical rain forest,needleleaf forest,temperate deciduous forest,ice and snow,tundra 
B) tundra,tropical rain forest,needleleaf forest,temperate deciduous forest,ice and snow 
C) temperate deciduous forest,tropical rain forest,needleleaf forest,ice and snow,tundra 
D) tropical rain forest,temperate deciduous forest,needleleaf forest,tundra,and ice and snow 
E) temperate deciduous forest,tundra,needleleaf forest,tropical rain forest,ice and snow.

Question 3

Which of the following combinations of agricultural practices would be the most sustainable?

Accepted Answer

A) monocultures use of synthetic fertilizers 
B) monocultures use of organic (natural)fertilizers 
C) multiple cropping use of synthetic fertilizers 
D) multiple cropping use of organic (natural)fertilizers 
A) monocultures use of synthetic fertilizers 
B) monocultures use of organic (natural)fertilizers 
C) multiple cropping use of synthetic fertilizers 
D) multiple cropping use of organic (natural)fertilizers

Question 4

The net dry weight of organic matter that feeds a food chain is

Accepted Answer

A) not related to net primary productivity. 
B) derived from respiration. 
C) biomass-or the useful amount of chemical energy. 
D) produced to a greater extent in tundra environments than in savannas. 
E) in not affected by abiotic ecosystem components 
A) not related to net primary productivity. 
B) derived from respiration. 
C) biomass-or the useful amount of chemical energy. 
D) produced to a greater extent in tundra environments than in savannas. 
E) in not affected by abiotic ecosystem components

Question 5

In nature,approximately ________ of the calories in plant matter survive from the primary to the secondary trophic (feeding,nutrition)level.

Accepted Answer

A) 10 percent 
B) 30 percent 
C) 50 percent 
D) 75 percent 
E) 90 percent 
A) 10 percent 
B) 30 percent 
C) 50 percent 
D) 75 percent 
E) 90 percent

Question 6

Eutrophication is part of the aquatic succession of a lake to a bog.

Accepted Answer

A) True 
 B)False

Question 7

A study of the spatial distribution of savanna biomes and the environmental factors that control that distribution would be an example of a topic studied in

Accepted Answer

A) biogeography. 
B) ecology. 
C) pedology. 
D) plant biology. 
E) geoarchaeology. 
A) biogeography. 
B) ecology. 
C) pedology. 
D) plant biology. 
E) geoarchaeology.

Question 8

Consider a food chain in which a grasshopper eats grass,the grasshopper is eaten by a frog,and the frog is eaten by a snake.Given these relationships,which of the following is correctly matched?

Accepted Answer

A) grass - herbivore 
B) grasshopper - autotroph 
C) frog - secondary consumer 
D) snake - primary consumer 
E) grass - primary consumer 
A) grass - herbivore 
B) grasshopper - autotroph 
C) frog - secondary consumer 
D) snake - primary consumer 
E) grass - primary consumer

Question 9

The fact that the majority of people are ________ in the food chain means that they can obtain the ________ dose of pollutants from the food they eat.

Accepted Answer

A) primary consumers smallest 
B) primary consumers largest 
C) top carnivores smallest 
D) top carnivores largest 
E) autotrophs smallest 
A) primary consumers smallest 
B) primary consumers largest 
C) top carnivores smallest 
D) top carnivores largest 
E) autotrophs smallest

Question 10

The oceans contain six times as much carbon as the atmosphere.

Accepted Answer

A) True 
 B)False

Question 11

Which of the following is used to identify a community?

Accepted Answer

A) climate,trophic structure and species present 
B) patterns of interdependence,species present,and trophic structure 
C) species present,trophic structure,and climate 
D) trophic structure,climate,and patterns of interdependence 
E) substrate,climate and patterns of interdependence 
A) climate,trophic structure and species present 
B) patterns of interdependence,species present,and trophic structure 
C) species present,trophic structure,and climate 
D) trophic structure,climate,and patterns of interdependence 
E) substrate,climate and patterns of interdependence

Question 12

Which of the following is true of synthetic fertilizers?

Accepted Answer

A) most contain sulphur compounds. 
B) their rate of production is doubling very quickly-every two years. 
C) the amount of compounds in these fertilizers far exceeds the ability of bacteria to break them down-thereby contributing to pollution of surface water. 
D) these fertilizers not only increase soil fertility,they also act to build the soil through the direct addition of organic matter. 
E) excess nitrogen is stored in the ecosystem for later use,making the ecosystem healthier. 
A) most contain sulphur compounds. 
B) their rate of production is doubling very quickly-every two years. 
C) the amount of compounds in these fertilizers far exceeds the ability of bacteria to break them down-thereby contributing to pollution of surface water. 
D) these fertilizers not only increase soil fertility,they also act to build the soil through the direct addition of organic matter. 
E) excess nitrogen is stored in the ecosystem for later use,making the ecosystem healthier.

Question 13

Which of the following is  correct ?

Accepted Answer

A) niche - function of a life form within a given environment 
B) ecosystem - mutually beneficial relationship 
C) community - specific location of an organism 
D) symbiotic relationships - a self-regulating association of living plants and animals and their nonliving environment 
E) habitat - interactions among populations living at a particular time 
A) niche - function of a life form within a given environment 
B) ecosystem - mutually beneficial relationship 
C) community - specific location of an organism 
D) symbiotic relationships - a self-regulating association of living plants and animals and their nonliving environment 
E) habitat - interactions among populations living at a particular time

Question 14

The most abundant natural elements in living matter are

Accepted Answer

A) silicon,aluminum,and calcium. 
B) oxygen,silicon,and aluminum. 
C) carbon,aluminum,and calcium. 
D) hydrogen,oxygen,and carbon. 
E) hydrogen,oxygen and silicon. 
A) silicon,aluminum,and calcium. 
B) oxygen,silicon,and aluminum. 
C) carbon,aluminum,and calcium. 
D) hydrogen,oxygen,and carbon. 
E) hydrogen,oxygen and silicon.

Question 15

An ecosystem is a self-regulating association of living plants and animals and their nonliving physical environment.

Accepted Answer

A) True 
 B)False

Question 16

Define the following: producers,consumers,carnivore,herbivore,decomposers,food chain,food web.

Accepted Answer

Certainly! Here are the definitions for

Question 17

If a lava flow completely destroys pre-existing plant communities,what type of succession will occur first?

Accepted Answer

A) pioneer 
B) primary 
C) secondary 
D) tertiary 
E) dynamic 
A) pioneer 
B) primary 
C) secondary 
D) tertiary 
E) dynamic

Question 18

An undisturbed ecosystem will most likely have the greatest amount of biomass at

Accepted Answer

A) an early stage. 
B) an intermediate stage. 
C) a mature stage. 
A) an early stage. 
B) an intermediate stage. 
C) a mature stage.

Question 19

As the rain forest is cleared,the amount of ________ available for organisms to live in is decreased,and this reduces the populations of plants and animals living there-thereby affecting plant and animal ________.

Accepted Answer

A) habitat communities 
B) communities habitats 
C) niches communities 
D) niches habitats 
E) ecosystem communities 
A) habitat communities 
B) communities habitats 
C) niches communities 
D) niches habitats 
E) ecosystem communities

Question 20

As world population continues to increase,it will become necessary for a greater percentage of the population to eat lower on the food chain in order to ensure an adequate food supply.

Accepted Answer

A) True 
 B)False

Exam 19: Ecosystem Essentials

If decomposers did not exist,the flow of nutrients would cease and the food chain would collapse.

Which of the following life-zone lists is in the correct sequence from lowest to highest elevation?

Which of the following combinations of agricultural practices would be the most sustainable?

The net dry weight of organic matter that feeds a food chain is

In nature,approximately ________ of the calories in plant matter survive from the primary to the secondary trophic (feeding,nutrition)level.

Eutrophication is part of the aquatic succession of a lake to a bog.

A study of the spatial distribution of savanna biomes and the environmental factors that control that distribution would be an example of a topic studied in

Consider a food chain in which a grasshopper eats grass,the grasshopper is eaten by a frog,and the frog is eaten by a snake.Given these relationships,which of the following is correctly matched?

The fact that the majority of people are ________ in the food chain means that they can obtain the ________ dose of pollutants from the food they eat.

The oceans contain six times as much carbon as the atmosphere.

Which of the following is used to identify a community?

Which of the following is true of synthetic fertilizers?

Which of the following is correct ?

The most abundant natural elements in living matter are

An ecosystem is a self-regulating association of living plants and animals and their nonliving physical environment.

Define the following: producers,consumers,carnivore,herbivore,decomposers,food chain,food web.

If a lava flow completely destroys pre-existing plant communities,what type of succession will occur first?

An undisturbed ecosystem will most likely have the greatest amount of biomass at

As the rain forest is cleared,the amount of ________ available for organisms to live in is decreased,and this reduces the populations of plants and animals living there-thereby affecting plant and animal ________.

As world population continues to increase,it will become necessary for a greater percentage of the population to eat lower on the food chain in order to ensure an adequate food supply.

Essentials of Geography

Solar Energy to Earth and the Seasons

Earth's Modern Atmosphere

Atmosphere and Surface Energy Balances

Global Temperatures

Atmospheric and Oceanic Circulations

Water and Atmospheric Moisture

Weather

Water Resources

Climate Systems and Climate Change

The Dynamic Planet

Tectonics, Earthquakes, and Volcanism

Weathering, Karst Landscapes, and Mass Movement

River Systems and Landforms

Eolian Processes and Arid Landscapes

The Oceans, Coastal Processes, and Landforms

Glacial and Periglacial Processes and Landforms

The Geography of Soils

Terrestrial Biomes

Earth and the Human Denominator

Filters

The fact that the majority of people are in the food chain means that they can obtain the dose of pollutants from the food they eat.

As the rain forest is cleared,the amount of available for organisms to live in is decreased,and this reduces the populations of plants and animals living there-thereby affecting plant and animal .