ENV 101 Final Exam V1 | ENV 101
Environmental Science | StraighterLine |
Q&A with Rationale (StraighterLine
ENV101 Final Exam)
1. Which of the following best describes the ‘Tragedy of the Commons’ as defined by Garrett
Hardin?
A. Individuals acting in their own self-interest deplete a shared resource.
B. Private ownership leads to the degradation of natural resources.
C. Government regulation is the only way to protect rare species.
D. Common resources are always managed sustainably by local communities.
Answer: A
Rationale: The Tragedy of the Commons occurs when individuals use a public resource for
personal gain without regard for the collective good. This behavior eventually leads to the
overexploitation and total depletion of the resource for everyone. Hardin argued that
without external regulation or private property rights, the resource is doomed to fail.
2. What is the primary difference between a ‘hypothesis’ and a ‘theory’ in the context of
environmental science?
A. A hypothesis is a proven fact, while a theory is a guess.
B. A hypothesis is a preliminary explanation, while a theory is well-supported by evidence.
,C. A theory is a testable explanation, while a hypothesis is a law.
D. There is no functional difference between the two terms in scientific research.
Answer: B
Rationale: A hypothesis is a specific, testable prediction that serves as a starting point for
an investigation. In contrast, a scientific theory is a broad explanation that has been
extensively tested and validated by many researchers. A theory represents a higher level of
certainty and serves as a cornerstone of scientific understanding.
3. In an energy pyramid, why is there significantly less energy available at higher trophic
levels?
A. Higher level consumers are smaller and require less energy.
B. Energy is lost as heat during metabolic processes at each level.
C. Decomposers remove most of the energy before it reaches the top.
D. Predators are more efficient at converting food into biomass.
Answer: B
Rationale: According to the Second Law of Thermodynamics, energy transfer is never 100
percent efficient. Approximately 90 percent of energy is lost as heat or used for metabolic
maintenance as it moves from one level to the next. This explains why ecosystems rarely
support more than four or five trophic levels.
, 4. Which process is responsible for converting atmospheric nitrogen into a form that plants
can use?
A. Denitrification
B. Photosynthesis
C. Transpiration
D. Nitrogen Fixation
Answer: D
Rationale: Nitrogen fixation is the process where atmospheric nitrogen (N2) is converted
into ammonia or other nitrogenous compounds. This is primarily performed by specialized
bacteria living in the soil or in symbiotic relationships with legumes. Without this process,
nitrogen would remain unavailable to most living organisms despite being abundant in the
atmosphere.
5. Which biome is characterized by permafrost, low temperatures, and minimal tree growth?
A. Tundra
B. Taiga
C. Temperate Grassland
D. Chaparral
Answer: A
Environmental Science | StraighterLine |
Q&A with Rationale (StraighterLine
ENV101 Final Exam)
1. Which of the following best describes the ‘Tragedy of the Commons’ as defined by Garrett
Hardin?
A. Individuals acting in their own self-interest deplete a shared resource.
B. Private ownership leads to the degradation of natural resources.
C. Government regulation is the only way to protect rare species.
D. Common resources are always managed sustainably by local communities.
Answer: A
Rationale: The Tragedy of the Commons occurs when individuals use a public resource for
personal gain without regard for the collective good. This behavior eventually leads to the
overexploitation and total depletion of the resource for everyone. Hardin argued that
without external regulation or private property rights, the resource is doomed to fail.
2. What is the primary difference between a ‘hypothesis’ and a ‘theory’ in the context of
environmental science?
A. A hypothesis is a proven fact, while a theory is a guess.
B. A hypothesis is a preliminary explanation, while a theory is well-supported by evidence.
,C. A theory is a testable explanation, while a hypothesis is a law.
D. There is no functional difference between the two terms in scientific research.
Answer: B
Rationale: A hypothesis is a specific, testable prediction that serves as a starting point for
an investigation. In contrast, a scientific theory is a broad explanation that has been
extensively tested and validated by many researchers. A theory represents a higher level of
certainty and serves as a cornerstone of scientific understanding.
3. In an energy pyramid, why is there significantly less energy available at higher trophic
levels?
A. Higher level consumers are smaller and require less energy.
B. Energy is lost as heat during metabolic processes at each level.
C. Decomposers remove most of the energy before it reaches the top.
D. Predators are more efficient at converting food into biomass.
Answer: B
Rationale: According to the Second Law of Thermodynamics, energy transfer is never 100
percent efficient. Approximately 90 percent of energy is lost as heat or used for metabolic
maintenance as it moves from one level to the next. This explains why ecosystems rarely
support more than four or five trophic levels.
, 4. Which process is responsible for converting atmospheric nitrogen into a form that plants
can use?
A. Denitrification
B. Photosynthesis
C. Transpiration
D. Nitrogen Fixation
Answer: D
Rationale: Nitrogen fixation is the process where atmospheric nitrogen (N2) is converted
into ammonia or other nitrogenous compounds. This is primarily performed by specialized
bacteria living in the soil or in symbiotic relationships with legumes. Without this process,
nitrogen would remain unavailable to most living organisms despite being abundant in the
atmosphere.
5. Which biome is characterized by permafrost, low temperatures, and minimal tree growth?
A. Tundra
B. Taiga
C. Temperate Grassland
D. Chaparral
Answer: A
