Question 1

Which of the following statements is true?

Accepted Answer

A) Plants cannot obtain nitrogen directly from the air. 
B) The roots of a plant provide nitrogen required for plant growth. 
C) Lightning striking the soil is the leading cause of water soluble nitrogen salts. 
D) All of the above are true. 
E) none of the above 
A) Plants cannot obtain nitrogen directly from the air. 
B) The roots of a plant provide nitrogen required for plant growth. 
C) Lightning striking the soil is the leading cause of water soluble nitrogen salts. 
D) All of the above are true. 
E) none of the above A

Question 2

Which of the following is an advantage of modern farming practices?

Accepted Answer

A) high crop yield 
B) pesticide damage to the environment 
C) depletion of soil nutrients 
D) fertilizer build-up in ground water 
E) All of the above are advantages. 
A) high crop yield 
B) pesticide damage to the environment 
C) depletion of soil nutrients 
D) fertilizer build-up in ground water 
E) All of the above are advantages. A

Question 3

Which of the following statements of trophic levels is not true?

Accepted Answer

A) It takes less energy to feed a creature at the top of the food chain. 
B) An animal can be both a secondary and primary consumer. 
C) Herbivores are consumers. 
D) Decomposers can be primary consumers. 
E) All of the above are true. 
A) It takes less energy to feed a creature at the top of the food chain. 
B) An animal can be both a secondary and primary consumer. 
C) Herbivores are consumers. 
D) Decomposers can be primary consumers. 
E) All of the above are true. A

Question 4

Which of the following is the main producer in a marine environment?

Accepted Answer

A) zooplankton 
B) grass 
C) phytoplankton 
D) all of the above 
E) none of the above 
A) zooplankton 
B) grass 
C) phytoplankton 
D) all of the above 
E) none of the above

Question 5

Which of the following statements of trophic levels is true?

Accepted Answer

A) There are far less consumers than producers. 
B) Carnivores are primary consumers. 
C) Herbivores are secondary consumers. 
D) Decomposers are not consumed. 
E) None of the above are true. 
A) There are far less consumers than producers. 
B) Carnivores are primary consumers. 
C) Herbivores are secondary consumers. 
D) Decomposers are not consumed. 
E) None of the above are true.

Question 6

What are the chances that you have already ingested a product made from a transgenic organism?

Accepted Answer

A) Transgenic organisms won't likely be entering our food supply for another several years. 
B) There is a slight chance because of the recently introduced organic food program of the U.S. Department of Agriculture. 
C) There is a moderate chance, especially for consumers of red meat. 
D) Because foods developed from transgenic organisms have been on the market for many years, the chances are great. 
A) Transgenic organisms won't likely be entering our food supply for another several years. 
B) There is a slight chance because of the recently introduced organic food program of the U.S. Department of Agriculture. 
C) There is a moderate chance, especially for consumers of red meat. 
D) Because foods developed from transgenic organisms have been on the market for many years, the chances are great.

Question 7

Which of the following describes nitrogen fixation?

Accepted Answer

A) special bacteria converting nitrogen gas into ammonium ions 
B) lightning causing nitrogen gas to react with oxygen gas and form nitrate ions 
C) combustion of ammonia gas to produce nitrate ions 
D) all of the above 
E) A and B only 
A) special bacteria converting nitrogen gas into ammonium ions 
B) lightning causing nitrogen gas to react with oxygen gas and form nitrate ions 
C) combustion of ammonia gas to produce nitrate ions 
D) all of the above 
E) A and B only

Question 8

Why might a sweet potato plant genetically engineered for a higher protein content have a greater intolerance for nitrogen-poor soils?

Accepted Answer

A) The plant requires more nitrogen so that it can produce a higher protein content. 
B) Genetically engineered plants tend not to be as hardy as regular plants. 
C) Plants genetically engineered to be more nutritious place greater demands on the soil. 
D) Because it contains higher protein content the plant would actually help in keeping the soil nitrogen-rich. 
A) The plant requires more nitrogen so that it can produce a higher protein content. 
B) Genetically engineered plants tend not to be as hardy as regular plants. 
C) Plants genetically engineered to be more nutritious place greater demands on the soil. 
D) Because it contains higher protein content the plant would actually help in keeping the soil nitrogen-rich.

Question 9

Why is it beneficial to grow two or three crops simultaneously in the same field?

Accepted Answer

A) improved soil fertility 
B) a greater diversity of agricultural products is afforded 
C) Infestations of a particular crop can be more easily contained. 
D) all of the above 
A) improved soil fertility 
B) a greater diversity of agricultural products is afforded 
C) Infestations of a particular crop can be more easily contained. 
D) all of the above

Question 10

The N-P-K system is used to describe ________.

Accepted Answer

A) the relative amounts of nitrogen, phosphorus and potassium in mixed fertilizers 
B) the identity of a straight fertilizer 
C) the climate zone in which a fertilizer works best 
D) the pounds of nickel, potassium, and krypton in a bag of mixed fertilizer 
E) B and C 
A) the relative amounts of nitrogen, phosphorus and potassium in mixed fertilizers 
B) the identity of a straight fertilizer 
C) the climate zone in which a fertilizer works best 
D) the pounds of nickel, potassium, and krypton in a bag of mixed fertilizer 
E) B and C

Question 11

Which of the following soil horizons contains the most organic matter?

Accepted Answer

A) substratum 
B) subsoil 
C) topsoil 
D) bottom soil 
E) humus 
A) substratum 
B) subsoil 
C) topsoil 
D) bottom soil 
E) humus

Question 12

What happens to most biochemical energy as it passes from one trophic level to the next?

Accepted Answer

A) Biochemical energy increases from one trophic level to the next. 
B) Biochemical energy decreases from one trophic level to the next. 
C) Biochemical energy does not change from one trophic level to the next. 
D) Biochemical energy decreases from the producer level to the primary consumer level. All other level changes show an increase in biochemical energy. 
A) Biochemical energy increases from one trophic level to the next. 
B) Biochemical energy decreases from one trophic level to the next. 
C) Biochemical energy does not change from one trophic level to the next. 
D) Biochemical energy decreases from the producer level to the primary consumer level. All other level changes show an increase in biochemical energy.

Question 13

Why don't plants grow well in nutrient-rich soils that contain a high percentage of clay?

Accepted Answer

A) The clay binds to the nutrients making them unavailable to the plants. 
B) The clay is very compact providing few open spaces for water and oxygen. 
C) The clay holds onto water for a long time to the point that root rot often occurs. 
D) Clay contains a high proportion of iron ions, which are toxic to plants. 
A) The clay binds to the nutrients making them unavailable to the plants. 
B) The clay is very compact providing few open spaces for water and oxygen. 
C) The clay holds onto water for a long time to the point that root rot often occurs. 
D) Clay contains a high proportion of iron ions, which are toxic to plants.

Question 14

Which of the following soil horizons contains an equal mixture of clay, sand and silt?

Accepted Answer

A) substratum 
B) subsoil 
C) topsoil 
D) bottom soil 
E) humus 
A) substratum 
B) subsoil 
C) topsoil 
D) bottom soil 
E) humus

Question 15

Which of the following is an organic farming method?

Accepted Answer

A) the use of fertilizers that contain only organic compounds 
B) the use of fertilizers that contain inorganic compounds 
C) the use of fertilizers that contain only synthetic fertilizers 
D) the use of organic compounds that act as pesticides 
E) none of the above 
A) the use of fertilizers that contain only organic compounds 
B) the use of fertilizers that contain inorganic compounds 
C) the use of fertilizers that contain only synthetic fertilizers 
D) the use of organic compounds that act as pesticides 
E) none of the above

Question 16

What is acting as the energy storage media in photosynthesis?

Accepted Answer

A) carbohydrates 
B) chlorophyll 
C) carbon dioxide 
D) oxygen 
E) water 
A) carbohydrates 
B) chlorophyll 
C) carbon dioxide 
D) oxygen 
E) water

Question 17

Which of the following might be the best use of genetic engineering for counteracting the negative effects of salinization?

Accepted Answer

A) Salt absorbing insects could be developed and set loose in regions of highly saline water resources. 
B) Sodium chloride could be engineered to be more soluble in water. 
C) Plants could be given a gene that turns them blue when they have absorbed too much salt. 
D) Genes from a salt-tolerant plant could be inserted into a desired crop plant. 
A) Salt absorbing insects could be developed and set loose in regions of highly saline water resources. 
B) Sodium chloride could be engineered to be more soluble in water. 
C) Plants could be given a gene that turns them blue when they have absorbed too much salt. 
D) Genes from a salt-tolerant plant could be inserted into a desired crop plant.

Question 18

Why do slowly degraded molecules like DDT have a tendency to accumulate in creatures higher in the food chain?

Accepted Answer

A) Since it takes more energy to feed a large animal, they take in more of the toxin. 
B) Since things higher on the food chain are large they have more fat, which means they can store more of the toxin. 
C) Larger animals do not excrete toxins as efficiently as smaller animals. 
D) Carnivores do not have the needed enzyme to biodegrade the toxin that herbivores have. 
E) none of the above 
A) Since it takes more energy to feed a large animal, they take in more of the toxin. 
B) Since things higher on the food chain are large they have more fat, which means they can store more of the toxin. 
C) Larger animals do not excrete toxins as efficiently as smaller animals. 
D) Carnivores do not have the needed enzyme to biodegrade the toxin that herbivores have. 
E) none of the above

Question 19

What potentially negative aspects of chlorinated hydrocarbons like DDT make them potentially detrimental to the environment?

Accepted Answer

A) They are not water soluble. 
B) They do not degrade rapidly. 
C) They accumulate in fat. 
D) all of the above 
E) only A and B 
A) They are not water soluble. 
B) They do not degrade rapidly. 
C) They accumulate in fat. 
D) all of the above 
E) only A and B

Question 20

When only synthetic fertilizers are used on a crop, the quantity used needs to be increased over time because ________.

Accepted Answer

A) they are washed away by seasonal rains, but residual fertilizers remain 
B) organisms in the soil develop a resistance to these fertilizers 
C) more and more genetically engineered crops are being planted 
D) synthetic fertilizers provide no organic bulk 
A) they are washed away by seasonal rains, but residual fertilizers remain 
B) organisms in the soil develop a resistance to these fertilizers 
C) more and more genetically engineered crops are being planted 
D) synthetic fertilizers provide no organic bulk

Which of the following statements is true?

Which of the following is an advantage of modern farming practices?

Which of the following statements of trophic levels is not true?

Which of the following is the main producer in a marine environment?

Which of the following statements of trophic levels is true?

What are the chances that you have already ingested a product made from a transgenic organism?

Which of the following describes nitrogen fixation?

Why might a sweet potato plant genetically engineered for a higher protein content have a greater intolerance for nitrogen-poor soils?

Why is it beneficial to grow two or three crops simultaneously in the same field?

The N-P-K system is used to describe ________.

Which of the following soil horizons contains the most organic matter?

What happens to most biochemical energy as it passes from one trophic level to the next?

Why don't plants grow well in nutrient-rich soils that contain a high percentage of clay?

Which of the following soil horizons contains an equal mixture of clay, sand and silt?

Which of the following is an organic farming method?

What is acting as the energy storage media in photosynthesis?

Which of the following might be the best use of genetic engineering for counteracting the negative effects of salinization?

Why do slowly degraded molecules like DDT have a tendency to accumulate in creatures higher in the food chain?

What potentially negative aspects of chlorinated hydrocarbons like DDT make them potentially detrimental to the environment?

When only synthetic fertilizers are used on a crop, the quantity used needs to be increased over time because ________.

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Protection Water and Air Resources

Capturing Energy

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Exam 15: Optimizing Food Production

Which of the following statements is true?

Which of the following is an advantage of modern farming practices?

Which of the following statements of trophic levels is not true?

Which of the following is the main producer in a marine environment?

Which of the following statements of trophic levels is true?

What are the chances that you have already ingested a product made from a transgenic organism?

Which of the following describes nitrogen fixation?

Why might a sweet potato plant genetically engineered for a higher protein content have a greater intolerance for nitrogen-poor soils?

Why is it beneficial to grow two or three crops simultaneously in the same field?

The N-P-K system is used to describe ________.

Which of the following soil horizons contains the most organic matter?

What happens to most biochemical energy as it passes from one trophic level to the next?

Why don't plants grow well in nutrient-rich soils that contain a high percentage of clay?

Which of the following soil horizons contains an equal mixture of clay, sand and silt?

Which of the following is an organic farming method?

What is acting as the energy storage media in photosynthesis?

Which of the following might be the best use of genetic engineering for counteracting the negative effects of salinization?

Why do slowly degraded molecules like DDT have a tendency to accumulate in creatures higher in the food chain?

What potentially negative aspects of chlorinated hydrocarbons like DDT make them potentially detrimental to the environment?

When only synthetic fertilizers are used on a crop, the quantity used needs to be increased over time because ________.

About Science

Particles of Matter

Elements of Chemistry

Subatomic Particles

The Atomic Nucleus

How Atoms Bond

How Molecules Mix

How Water Behaves

How Chemicals React

Acids and Bases in Our Environment

Oxidations and Reductions Charge the World

Organic Compounds

Nutrients of Life

Medicinal Chemistry

Protection Water and Air Resources

Capturing Energy

Filters