Question 1

____________________ can help scientists understand large and very complex systems by allowing them to change variables and project possible changes.

Accepted Answer

The answer of ____________________ can help scientists understand large and...

Question 2

Which consumers feed on the flesh of herbivores?

Accepted Answer

A) primary consumers 
B) secondary consumers 
C) tertiary consumers 
D) apoptotic consumers 
E) bioconsumers

Question 3

Nutrient cycles connect past, present, and future forms of life.

Accepted Answer

A) True 
 B)False

Question 4

The typical percentage of high quality energy loss in transfers from one trophic level to the next is about ____.

Accepted Answer

A) 1% 
B) 5% 
C) 35% 
D) 60% 
E) 90%

Question 5

What is a result of phosphate rich runoff from land?

Accepted Answer

A) improved agricultural production 
B) increased growth of algae in streams, lakes, and other water bodies 
C) healthier forests and increased forest growth 
D) decreased need for fertilization of agricultural crops 
E) erosion and release of marine sediments

Question 6

Carbon is a major component of ____.

Accepted Answer

A) water 
B) the oceans 
C) organic compounds 
D) the atmosphere 
E) hydrologic cycle

Question 7

In hundreds of years, we have released large quantities of fossil fuels that took millions of years to form.

Accepted Answer

A) True 
 B)False

Question 8

How much of the earth's water supply is available as accessible liquid freshwater?

Accepted Answer

A) 0.024% 
B) 2.1% 
C) 4.7% 
D) 7.1% 
E) 9.6%

Question 9

Vitousek, Rojstaczer, and others estimate humans now use, waste, or destroy what percentage of the earth's total potential NPP?

Accepted Answer

A) 18% 
B) 28% 
C) 38% 
D) 58% 
E) 78%

Question 10

Tropical rain forests may be prevented from returning to cleared areas if an irreversible ______________ is reached.

Accepted Answer

The answer of Tropical rain forests may be prevented from...

Question 11

Humans add sulfur to the atmosphere primarily by the release of ____.

Accepted Answer

A) sulfate 
B) DMS 
C) hydrogen sulfide 
D) sulfur trioxide 
E) sulfur dioxide

Question 12

Use the accompanying figure to answer the following question(s). What group is indicated by letter E, to which all organisms in the pyramid eventually succumb?

Accepted Answer

The answer of  Use the accompanying figure to answer...

Question 13

Complex networks of interconnected food chains are ____.

Accepted Answer

A) food webs 
B) food distribution interactions 
C) trophic levels 
D) pyramids of energy 
E) trophic chains

Question 14

Transfer of energy through food chains or webs is very efficient, making a lot of energy available to organisms.

Accepted Answer

A) True 
 B)False

Question 15

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Accepted Answer

A) True 
 B)False

Question 16

Organisms that cannot produce their own food and, therefore, must eat other organisms, are called ____________________.

Accepted Answer

The answer of Organisms that cannot produce their own food...

Question 17

What is the term for the portion of the earth's atmosphere, hydrosphere, and geosphere where life is found?

Accepted Answer

A) organosphere 
B) biological base 
C) community 
D) ecosystem 
E) biosphere

Question 18

The hydrologic cycle is the movement of ____.

Accepted Answer

A) carbon 
B) hydrogen 
C) hydrocarbons 
D) carbohydrates 
E) water

Question 19

Consider the concept of trophic levels, and explain why it may be necessary for humans to eat less meat. How much energy is lost from one level to the next? Use numbers to support your argument.

Accepted Answer

The answer of Consider the concept of trophic levels, and...

Question 20

Nitrogen fixation is accomplished by specialized ____________________ in the soil and ____________________ in aquatic environments.

Accepted Answer

The answer of Nitrogen fixation is accomplished by specialized ____________________...

Exam 3: Ecosystems: What Are They and How Do They Work

____________________ can help scientists understand large and very complex systems by allowing them to change variables and project possible changes.

Which consumers feed on the flesh of herbivores?

Nutrient cycles connect past, present, and future forms of life.

The typical percentage of high quality energy loss in transfers from one trophic level to the next is about ____.

What is a result of phosphate rich runoff from land?

Carbon is a major component of ____.

In hundreds of years, we have released large quantities of fossil fuels that took millions of years to form.

How much of the earth's water supply is available as accessible liquid freshwater?

Vitousek, Rojstaczer, and others estimate humans now use, waste, or destroy what percentage of the earth's total potential NPP?

Tropical rain forests may be prevented from returning to cleared areas if an irreversible ______________ is reached.

Humans add sulfur to the atmosphere primarily by the release of ____.

Use the accompanying figure to answer the following question(s). What group is indicated by letter E, to which all organisms in the pyramid eventually succumb?

Complex networks of interconnected food chains are ____.

Transfer of energy through food chains or webs is very efficient, making a lot of energy available to organisms.

The reason we observe a "pyramid" of energy flow instead of an energy flow "cube" is because the low ecological efficiency of biological systems limits the numbers of organism in the higher trophic levels.

Organisms that cannot produce their own food and, therefore, must eat other organisms, are called ____________________.

What is the term for the portion of the earth's atmosphere, hydrosphere, and geosphere where life is found?

The hydrologic cycle is the movement of ____.

Consider the concept of trophic levels, and explain why it may be necessary for humans to eat less meat. How much energy is lost from one level to the next? Use numbers to support your argument.

Nitrogen fixation is accomplished by specialized in the soil and in aquatic environments.