Question 1

Where do terrestrial plants obtain the necessary carbon for photosynthesis?

Accepted Answer

Plants obtain the ma

Question 2

In the second half of the twentieth century, human activities have more than tripled the amount of nitrogen released from land into the atmosphere or aquatic systems.

Accepted Answer

A) True 
 B)False

Question 3

A large percentage of energy passes on from one trophic level to the next.

Accepted Answer

A) True 
 B)False

Question 4

The main natural source of phosphorus is ____. ​

Accepted Answer

A) Earth's crust 
B) fertilizer 
C) guano 
D) legumes 
E) water 
A) Earth's crust 
B) fertilizer 
C) guano 
D) legumes 
E) water

Question 5

What are the specific environmental consequences of a phytoplankton bloom? ​

Accepted Answer

A) An increase in phytoplankton acidifies ocean water. 
B) Phytoplankton are decomposed by aerobic bacteria, which depletes the surrounding water of oxygen. 
C) Phytoplankton fix nitrogen in the water causing nitrification. 
D) Phytoplankton are decomposed by anaerobic bacteria which enriches the surrounding water with oxygen. 
E) Phytoplankton use up hydrogen ions, which decreases the acidity of the surrounding water. 
A) An increase in phytoplankton acidifies ocean water. 
B) Phytoplankton are decomposed by aerobic bacteria, which depletes the surrounding water of oxygen. 
C) Phytoplankton fix nitrogen in the water causing nitrification. 
D) Phytoplankton are decomposed by anaerobic bacteria which enriches the surrounding water with oxygen. 
E) Phytoplankton use up hydrogen ions, which decreases the acidity of the surrounding water.

Question 6

The Lake Erie ecosystem was affected by humans because human activities ____. ​

Accepted Answer

A) extracted resources without replacement 
B) caused global warming 
C) used the water without replacement 
D) disrupted energy flow and the cycling of nutrients 
E) extracted energy without replacement 
A) extracted resources without replacement 
B) caused global warming 
C) used the water without replacement 
D) disrupted energy flow and the cycling of nutrients 
E) extracted energy without replacement

Question 7

Match between columns
                        Premises: terrestrial food webs

Accepted Answer

The Answer of  D and  A and  is...

Question 8

Salt marsh cordgrass is consumed by herbivorous marsh periwinkle snails, which in turn are consumed by blue crabs. Research has shown that cordgrass productivity is controlled ____. ​

Accepted Answer

A) indirectly by the abundance of snails 
B) indirectly by the abundance of snail predators 
C) directly by the abundance of snail predators 
D) directly by the availability of nutrients in the salt marsh 
E) indirectly by the amount of sunlight penetrating the water 
A) indirectly by the abundance of snails 
B) indirectly by the abundance of snail predators 
C) directly by the abundance of snail predators 
D) directly by the availability of nutrients in the salt marsh 
E) indirectly by the amount of sunlight penetrating the water

Question 9

Once in the ocean, most of the available phosphorous ____. ​

Accepted Answer

A) enters marine food webs 
B) enters ocean plants 
C) becomes ionized 
D) precipitates out of solution 
E) enters a gaseous phase 
A) enters marine food webs 
B) enters ocean plants 
C) becomes ionized 
D) precipitates out of solution 
E) enters a gaseous phase

Question 10

Assimilation efficiency is the ratio of ____. ​

Accepted Answer

A) energy content of food consumed to the energy content of food available 
B) energy absorbed from consumed food to the food's total energy content 
C) energy content of new tissue produced to the energy assimilated from food 
D) net productivity at one trophic level to the trophic level below 
E) producers to consumers 
A) energy content of food consumed to the energy content of food available 
B) energy absorbed from consumed food to the food's total energy content 
C) energy content of new tissue produced to the energy assimilated from food 
D) net productivity at one trophic level to the trophic level below 
E) producers to consumers

Question 11

The standing crop biomass is the ____. ​

Accepted Answer

A) amount of sunlight absorbed by the plants 
B) amount of water accumulated per acre of crop plants 
C) total dry weight of plants at a given time 
D) number of plant species present 
E) productivity of the plants 
A) amount of sunlight absorbed by the plants 
B) amount of water accumulated per acre of crop plants 
C) total dry weight of plants at a given time 
D) number of plant species present 
E) productivity of the plants

Question 12

Lake ecosystems have many trophic levels.

Accepted Answer

A) True 
 B)False

Question 13

Match between columns
                        Premises: primary consumers

Accepted Answer

The Answer of A and B and C and D is...

Question 14

Climate change leads to ____, which releases additional carbon dioxide into the atmosphere. ​

Accepted Answer

A) increased frequency and severity of forest fires 
B) increased logging 
C) increased size of polar ice caps 
D) sea level reductions 
E) increased severity of volcanic eruptions 
A) increased frequency and severity of forest fires 
B) increased logging 
C) increased size of polar ice caps 
D) sea level reductions 
E) increased severity of volcanic eruptions

Question 15

Greenhouse gases include ____. ​

Accepted Answer

A) carbon dioxide, water, nitrogen, and hydrogen 
B) carbon dioxide, water, methane, ozone, and nitrous oxide 
C) carbon dioxide, phosphorous, water, and ozone 
D) carbon dioxide, methane, and carbon monoxide 
E) carbon dioxide, ozone, nitrous oxide, and phosphorous 
A) carbon dioxide, water, nitrogen, and hydrogen 
B) carbon dioxide, water, methane, ozone, and nitrous oxide 
C) carbon dioxide, phosphorous, water, and ozone 
D) carbon dioxide, methane, and carbon monoxide 
E) carbon dioxide, ozone, nitrous oxide, and phosphorous

Question 16

How is the net primary productivity of an ecosystem calculated?

Accepted Answer

The energy used for cellular r

Question 17

Which factor has caused primary productivity in Amazon forests to decline steadily over the past 30 years? ​

Accepted Answer

A) ocean acidification 
B) nitrogen fixation 
C) soil runoff 
D) increasing droughts 
E) depletion of oxygen in the atmosphere 
A) ocean acidification 
B) nitrogen fixation 
C) soil runoff 
D) increasing droughts 
E) depletion of oxygen in the atmosphere

Question 18

The largest reservoir of carbon is ____. ​

Accepted Answer

A) consumers 
B) nutrients in soil 
C) producers 
D) sedimentary rock 
E) water 
A) consumers 
B) nutrients in soil 
C) producers 
D) sedimentary rock 
E) water

Question 19

How much energy is ultimately converted into chemical energy by photosynthesis? ​

Accepted Answer

A) less than 1% 
B) 1-2% 
C) 5% 
D) 10% 
E) 20% 
A) less than 1% 
B) 1-2% 
C) 5% 
D) 10% 
E) 20%

Question 20

Match between columns
                        Premises: gross primary productivity minus the energy used for cellular respiration

Accepted Answer

The Answer of pyramid of biomass and ecological efficiency and is...

Exam 54: Ecosystems

Where do terrestrial plants obtain the necessary carbon for photosynthesis?

In the second half of the twentieth century, human activities have more than tripled the amount of nitrogen released from land into the atmosphere or aquatic systems.

A large percentage of energy passes on from one trophic level to the next.

The main natural source of phosphorus is ____. ​

What are the specific environmental consequences of a phytoplankton bloom? ​

The Lake Erie ecosystem was affected by humans because human activities ____. ​

Salt marsh cordgrass is consumed by herbivorous marsh periwinkle snails, which in turn are consumed by blue crabs. Research has shown that cordgrass productivity is controlled ____. ​

Once in the ocean, most of the available phosphorous ____. ​

Assimilation efficiency is the ratio of ____. ​

The standing crop biomass is the ____. ​

Lake ecosystems have many trophic levels.

Climate change leads to ____, which releases additional carbon dioxide into the atmosphere. ​

Greenhouse gases include ____. ​

How is the net primary productivity of an ecosystem calculated?

Which factor has caused primary productivity in Amazon forests to decline steadily over the past 30 years? ​

The largest reservoir of carbon is ____. ​

How much energy is ultimately converted into chemical energy by photosynthesis? ​

Introduction to Biological Concepts and Research

Life, Chemistry, and Water

Biological Molecules: the Carbon Compounds of Life

Cells

Membranes and Transport

Energy, Enzymes, and Biological Reactions

Cellular Respiration: Harvesting Chemical Energy

Photosynthesis

Cell Communication

Cell Division and Mitosis

Meiosis: the Cellular Basis of Sexual Reproduction

Mendel, Genes, and Inheritance

Genes, Chromosomes, and Human Genetics

DNA Structure, Replication, and Organization

From DNA to Protein

Regulation of Gene Expression

Bacterial and Viral Genetics

Dna Technologies: Making and Using Genetically Altered Organisms, and Other Applications

Genomes and Proteomes

The Development of Evolutionary Thought

Microevolution: Genetic Changes Within Populations

Speciation

Paleobiology and Macroevolution

Systematic Biology: Phylogeny and Classification

The Origin of Life

Prokaryotes and Viruses

Protists

Seedless Plants

Seed Plants

Fungi

Animal Phylogeny, Acoelomates, and Protostomes

Deuterostomes: Vertebrates and Their Closest Relatives

The Plant Body

Transport in Plants

Plant Nutrition

Reproduction and Development in Flowering Plants

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Information Flow and the Neuron

Nervous Systems

Sensory Systems

The Endocrine System

Muscles, Bones, and Body Movements

The Circulatory System

Defenses Against Disease

Gas Exchange: the Respiratory System

Animal Nutrition

Regulating the Internal Environment

Animal Reproduction

Animal Development

Ecology and the Biosphere

Population Ecology

Population Interactions and Community Ecology

Biodiversity and Conservation Biology

Animal Behavior

Filters

The main natural source of phosphorus is ____.

What are the specific environmental consequences of a phytoplankton bloom?

The Lake Erie ecosystem was affected by humans because human activities ____.

Salt marsh cordgrass is consumed by herbivorous marsh periwinkle snails, which in turn are consumed by blue crabs. Research has shown that cordgrass productivity is controlled ____.

Once in the ocean, most of the available phosphorous ____.

Assimilation efficiency is the ratio of ____.

The standing crop biomass is the ____.

Climate change leads to ____, which releases additional carbon dioxide into the atmosphere.

Greenhouse gases include ____.

Which factor has caused primary productivity in Amazon forests to decline steadily over the past 30 years?

The largest reservoir of carbon is ____.

How much energy is ultimately converted into chemical energy by photosynthesis?