Mc - 05 The Ecosystem
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Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
Ch 5 The ecosystem [052001] An ecosystem is composed of (1) a group of interacting populations. (2) environmental factors affecting the populations. (3) the sun. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3) A [052002] Directions: The following two questions refer to the food chain below. grass → grasshopper → small bird → eagle Which organism(s) in the above food chain is/are (a) consumer(s)? A Grass B Grasshopper C Eagle D Grasshopper, small bird and eagle D [052003] [E] What is the ecological relationship between grass and grasshopper? A Predation B Competition C Commensalism D Pyramid of numbers A
Oxford University Press 2005
Page 1 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052004] Decomposers return carbon to the ecosystem in the form of A urea. B carbon dioxide. C protein. D fat. B [052005] How is energy lost as it is transferred up trophic levels? A Through predation B Through competition C Through respiration D Through respiration and uneaten organisms D [052006] Directions: The following two questions refer to the food chain below. microscopic plant → small fish → large fish → heron [E] Which organism may accumulate the highest level of toxic substances in an individual? A large fish B small fish C heron D microscopic plant C [052007] [E] Which organism may accumulate the highest level of toxic substances in terms of the whole trophic level? A large fish B small fish C heron D microscopic plant D
Oxford University Press 2005
Page 2 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052008] Which of the following is the corresponding pyramid of biomass of the food chain? oak tree → caterpillar → parasite inside the caterpillar A
B
C
D
A [052009] [E] Which of the following statements about the nitrogen cycle is correct? A Nitrogen-fixing bacteria can turn atmospheric nitrogen into nitrite ions. B Nitrite ions are changed into nitrate ions by denitrifying bacteria. C Nitrite bacteria can change the nitrogen in the dead bodies into nitrite ions. D Producers absorb nitrogen in the form of nitrate ions. D [052010] [E] Which of the following pairs demonstrates commensalism? A Lion and human B Barnacle and crab C Tapeworm and pig D Bee and flower B
Oxford University Press 2005
Page 3 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052101] Which of the following statements are correct? (1) Producers use light or chemical energy to make food from inorganic substances. (2) The population of producers is always larger than that of primary consumers. (3) Herbivores are primary consumers. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3) B [052102] In a self-sustained ecosystem, which of the following may be absent? A
Producers
B
Primary consumers
C
Decomposers
D
Energy source
B
Oxford University Press 2005
Page 4 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052103] Directions: The following three questions refer to the diagram below, which shows a food web in a certain ecosystem.
Which of the following organisms can capture energy from the sun to produce food? A Organism Q B Organism U C Organisms R and S D Organisms T and U A [052104] If organism T is removed from the food web, what would probably happen to organisms R and S in the long run? Organism R Organism S A Increase in population Increase in population B Increase in population Decrease in population C Increase in population Population remains the same D Decrease in population Increase in population C [052105] [E] What are the relationships between (1) organisms R and Q, (2) organisms T and U? (1) (2) A Predation Commensalism B Predation Competition C Mutualism Competition D Parasitism Commensalism Oxford University Press 2005
Page 5 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
B [052106] The following is a pyramid of numbers representing a certain food chain. parasite carnivore herbivore producer
The number of herbivores is larger than that of the producers because A there is no energy loss from the producer to the herbivore. B the producer has a shorter life span than that of the herbivore. C the carnivore does not feed entirely on the herbivore. D the size of the producer is large enough to support a number of herbivores. D [052107] [E] An artificial pesticide DDT is washed to the sea by the rain. Which of the following organisms in the sea would contain the highest level of DDT? A
Cuttlefish
B
Crab
C
Algae
D
Whale
D Oxford University Press 2005
Page 6 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
Oxford University Press 2005
Page 7 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052108] [E] Which of the following forms of nitrogen can be absorbed directly by producers? A Nitrate ion B Nitrite ion C Ammonium ion D Nitrogen dioxide A [052109] Directions: The following two questions refer to the nitrogen cycle below.
[E] What are organisms X and Y? Organism X Organism Y A Nitrate bacteria Nitrite bacteria B Nitrate bacteria Nitrogen-fixing bacteria C Nitrite bacteria Nitrate bacteria D Nitrite bacteria Nitrogen-fixing bacteria B [052110] [E] In the absence of organism Y, through which of the following processes can nitrogen gas in the atmosphere be converted into nitrogen compounds? A Decomposition B Respiration C Lightning Oxford University Press 2005
Page 8 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
D
Chapter 5 MC Questions
Photosynthesis
C
Oxford University Press 2005
Page 9 / 9
Chapter 5 MC Questions
Ch 5 The ecosystem [052001] An ecosystem is composed of (1) a group of interacting populations. (2) environmental factors affecting the populations. (3) the sun. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3) A [052002] Directions: The following two questions refer to the food chain below. grass → grasshopper → small bird → eagle Which organism(s) in the above food chain is/are (a) consumer(s)? A Grass B Grasshopper C Eagle D Grasshopper, small bird and eagle D [052003] [E] What is the ecological relationship between grass and grasshopper? A Predation B Competition C Commensalism D Pyramid of numbers A
Oxford University Press 2005
Page 1 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052004] Decomposers return carbon to the ecosystem in the form of A urea. B carbon dioxide. C protein. D fat. B [052005] How is energy lost as it is transferred up trophic levels? A Through predation B Through competition C Through respiration D Through respiration and uneaten organisms D [052006] Directions: The following two questions refer to the food chain below. microscopic plant → small fish → large fish → heron [E] Which organism may accumulate the highest level of toxic substances in an individual? A large fish B small fish C heron D microscopic plant C [052007] [E] Which organism may accumulate the highest level of toxic substances in terms of the whole trophic level? A large fish B small fish C heron D microscopic plant D
Oxford University Press 2005
Page 2 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052008] Which of the following is the corresponding pyramid of biomass of the food chain? oak tree → caterpillar → parasite inside the caterpillar A
B
C
D
A [052009] [E] Which of the following statements about the nitrogen cycle is correct? A Nitrogen-fixing bacteria can turn atmospheric nitrogen into nitrite ions. B Nitrite ions are changed into nitrate ions by denitrifying bacteria. C Nitrite bacteria can change the nitrogen in the dead bodies into nitrite ions. D Producers absorb nitrogen in the form of nitrate ions. D [052010] [E] Which of the following pairs demonstrates commensalism? A Lion and human B Barnacle and crab C Tapeworm and pig D Bee and flower B
Oxford University Press 2005
Page 3 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052101] Which of the following statements are correct? (1) Producers use light or chemical energy to make food from inorganic substances. (2) The population of producers is always larger than that of primary consumers. (3) Herbivores are primary consumers. A (1) and (2) only B (1) and (3) only C (2) and (3) only D (1), (2) and (3) B [052102] In a self-sustained ecosystem, which of the following may be absent? A
Producers
B
Primary consumers
C
Decomposers
D
Energy source
B
Oxford University Press 2005
Page 4 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052103] Directions: The following three questions refer to the diagram below, which shows a food web in a certain ecosystem.
Which of the following organisms can capture energy from the sun to produce food? A Organism Q B Organism U C Organisms R and S D Organisms T and U A [052104] If organism T is removed from the food web, what would probably happen to organisms R and S in the long run? Organism R Organism S A Increase in population Increase in population B Increase in population Decrease in population C Increase in population Population remains the same D Decrease in population Increase in population C [052105] [E] What are the relationships between (1) organisms R and Q, (2) organisms T and U? (1) (2) A Predation Commensalism B Predation Competition C Mutualism Competition D Parasitism Commensalism Oxford University Press 2005
Page 5 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
B [052106] The following is a pyramid of numbers representing a certain food chain. parasite carnivore herbivore producer
The number of herbivores is larger than that of the producers because A there is no energy loss from the producer to the herbivore. B the producer has a shorter life span than that of the herbivore. C the carnivore does not feed entirely on the herbivore. D the size of the producer is large enough to support a number of herbivores. D [052107] [E] An artificial pesticide DDT is washed to the sea by the rain. Which of the following organisms in the sea would contain the highest level of DDT? A
Cuttlefish
B
Crab
C
Algae
D
Whale
D Oxford University Press 2005
Page 6 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
Oxford University Press 2005
Page 7 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
Chapter 5 MC Questions
[052108] [E] Which of the following forms of nitrogen can be absorbed directly by producers? A Nitrate ion B Nitrite ion C Ammonium ion D Nitrogen dioxide A [052109] Directions: The following two questions refer to the nitrogen cycle below.
[E] What are organisms X and Y? Organism X Organism Y A Nitrate bacteria Nitrite bacteria B Nitrate bacteria Nitrogen-fixing bacteria C Nitrite bacteria Nitrate bacteria D Nitrite bacteria Nitrogen-fixing bacteria B [052110] [E] In the absence of organism Y, through which of the following processes can nitrogen gas in the atmosphere be converted into nitrogen compounds? A Decomposition B Respiration C Lightning Oxford University Press 2005
Page 8 / 9
Certificate Biology − New Mastering Basic Concepts Question Bank V2.0
D
Chapter 5 MC Questions
Photosynthesis
C
Oxford University Press 2005
Page 9 / 9
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