Question 1

In open-water marine ecosystems, the ________ occupy the same trophic level as the giant sequoias (redwoods)in the forests of California.

Accepted Answer

A) fast-swimming, fish-eating tuna 
B) giant, squid-eating whales 
C) microscopic bacteria that decompose all the other organisms once they have died 
D) microscopic, single-celled algae (protists)called phytoplankton ("plant-like drifters") 
E) tiny, multicellular zooplankton ("animal drifters")that feed on phytoplankton 
A) fast-swimming, fish-eating tuna 
B) giant, squid-eating whales 
C) microscopic bacteria that decompose all the other organisms once they have died 
D) microscopic, single-celled algae (protists)called phytoplankton ("plant-like drifters") 
E) tiny, multicellular zooplankton ("animal drifters")that feed on phytoplankton

Question 2

Explain why decomposers and detritus feeders are so important to ecosystems.

Accepted Answer

They recycle nutrients to simp

Question 3

The first trophic level of an ecosystem consists of:

Accepted Answer

A) primary consumers. 
B) detritus feeders. 
C) secondary consumers. 
D) producers. 
E) heterotrophs. 
A) primary consumers. 
B) detritus feeders. 
C) secondary consumers. 
D) producers. 
E) heterotrophs.

Question 4

Deforestation decreases the levels of greenhouse gases in the atmosphere. True or False?

Accepted Answer

A) True 
 B)False

Question 5

Carnivores are usually:

Accepted Answer

A) secondary consumers. 
B) primary consumers. 
C) autotrophs. 
D) detritus consumers. 
E) consumer producers. 
A) secondary consumers. 
B) primary consumers. 
C) autotrophs. 
D) detritus consumers. 
E) consumer producers.

Question 6

Sulfur dioxide is a natural product of volcanoes and hot springs, and by itself it is not acidic. How then is excess sulfur dioxide linked to acid rain or acid deposition?

Accepted Answer

Human industrial activities account for

Question 7

Organisms that must rely on complex, high-energy molecules produced by other organisms for survival are:

Accepted Answer

A) heterotrophs. 
B) producers. 
C) autotrophs. 
D) denitrifying bacteria. 
E) cyanobacteria. 
A) heterotrophs. 
B) producers. 
C) autotrophs. 
D) denitrifying bacteria. 
E) cyanobacteria.

Question 8

What would happen to an ecosystem if all the plants died?

Accepted Answer

Oxygen levels would

Question 9

One of the largest reservoirs for phosphorus on Earth is ________.

Accepted Answer

The answer of One of the largest reservoirs for phosphorus...

Question 10

Many climatologists blame the recent extremes in weather on global warning. True or False?

Accepted Answer

A) True 
 B)False

Question 11

Which of the following components is NOT involved in the phosphorus cycle?

Accepted Answer

A) the atmosphere 
B) some rocks and soil 
C) producers 
D) consumers 
E) decomposers 
A) the atmosphere 
B) some rocks and soil 
C) producers 
D) consumers 
E) decomposers

Question 12

Detritus feeders remove nutrients from the food chain. True or False?

Accepted Answer

A) True 
 B)False

Question 13

Only a small percentage of the energy that arrives at the outer atmosphere of Earth reaches the surface and is then captured within ecosystems. What percentage is captured by photosynthetic organisms?

Accepted Answer

A) 5% 
B) 3% 
C) 1% 
D) 0)03% 
E) 0)0001% 
A) 5% 
B) 3% 
C) 1% 
D) 0)03% 
E) 0)0001%

Question 14

Which level of the energy pyramid has the greatest biomass?

Accepted Answer

A) heterotrophs 
B) producers 
C) carnivores 
D) primary consumers 
E) secondary consumers 
A) heterotrophs 
B) producers 
C) carnivores 
D) primary consumers 
E) secondary consumers

Question 15

Phosphorus, which is often a limiting nutrient in ecosystems, is very important because it:

Accepted Answer

A) is needed for molecules such as ATP, cell membranes, and nucleic acids. 
B) evaporates quickly. 
C) is found only in sedimentary rocks. 
D) is necessary for the production of cellulose so that autotrophs can grow and provide food for heterotrophs. 
E) is part of the hydrologic cycle. 
A) is needed for molecules such as ATP, cell membranes, and nucleic acids. 
B) evaporates quickly. 
C) is found only in sedimentary rocks. 
D) is necessary for the production of cellulose so that autotrophs can grow and provide food for heterotrophs. 
E) is part of the hydrologic cycle.

Question 16

Fossil fuels are the major reservoir in the phosphorus cycle. True or False?

Accepted Answer

A) True 
 B)False

Question 17

Why is phosphorus so important to living organisms?

Accepted Answer

In the form of phosphate, phos

Question 18

Your ________ is a measure of your impact on the environment based on the amount of greenhouse gases you emit.

Accepted Answer

The answer of Your ________ is a measure of your...

Question 19

Since plants cannot fix nitrogen, why are legumes often called nitrogen fixers?

Accepted Answer

Legumes have nitroge

Question 20

Once used by an organism, carbon and nitrogen ions are unavailable for other organisms. True or False?

Accepted Answer

A) True 
 B)False

Exam 28: How Do Ecosystems Work

In open-water marine ecosystems, the ________ occupy the same trophic level as the giant sequoias (redwoods)in the forests of California.

Explain why decomposers and detritus feeders are so important to ecosystems.

The first trophic level of an ecosystem consists of:

Deforestation decreases the levels of greenhouse gases in the atmosphere. True or False?

Carnivores are usually:

Sulfur dioxide is a natural product of volcanoes and hot springs, and by itself it is not acidic. How then is excess sulfur dioxide linked to acid rain or acid deposition?

Organisms that must rely on complex, high-energy molecules produced by other organisms for survival are:

What would happen to an ecosystem if all the plants died?

One of the largest reservoirs for phosphorus on Earth is ________.

Many climatologists blame the recent extremes in weather on global warning. True or False?

Which of the following components is NOT involved in the phosphorus cycle?

Detritus feeders remove nutrients from the food chain. True or False?

Only a small percentage of the energy that arrives at the outer atmosphere of Earth reaches the surface and is then captured within ecosystems. What percentage is captured by photosynthetic organisms?

Which level of the energy pyramid has the greatest biomass?

Phosphorus, which is often a limiting nutrient in ecosystems, is very important because it:

Fossil fuels are the major reservoir in the phosphorus cycle. True or False?

Why is phosphorus so important to living organisms?

Your ________ is a measure of your impact on the environment based on the amount of greenhouse gases you emit.

Since plants cannot fix nitrogen, why are legumes often called nitrogen fixers?

Once used by an organism, carbon and nitrogen ions are unavailable for other organisms. True or False?

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

The Continuity of Life: Cellular Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amidst Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity Ii: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Animal Development

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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