ENV 101 GRADED EXAMS 1–4 – ENVIRONMENTAL SCIENCE
– ACTUAL Q&A (STRAIGHTERLINE) (UPDATED PDF)
THIS COMPREHENSIVE EXAM IS DESIGNED TO MIRROR THE CURRICULUM FOUND
IN ENV 101: ENVIRONMENTAL SCIENCE (STRAIGHTERLINE), COVERING THE
FOUNDATIONAL PRINCIPLES OF ECOLOGY, HUMAN IMPACT, RESOURCE
MANAGEMENT, AND SUSTAINABILITY.
ENV 101: Environmental Science Comprehensive Exam
Table of Contents
1. Section 1: Foundations of Environmental Science & Ecology (Questions 1–25)
2. Section 2: Populations, Biomes, and Agriculture (Questions 26–50)
3. Section 3: Toxicology, Air, and Water Systems (Questions 51–75)
4. Section 4: Energy, Waste, and Policy (Questions 76–100)
Section 1: Foundations of Environmental Science & Ecology
1. Which of the following best describes the "Tragedy of the Commons"?
• A) Private land being overused by the owner.
• B) Shared resources being depleted by individuals acting in their own self-interest.
• C) Government-regulated forests being harvested sustainably.
• D) The extinction of a species due to natural causes.
• Answer: B
• Rationale: The Tragedy of the Commons occurs when individuals use a public resource
(like air, water, or grazing land) for their own benefit without regard for the long-term
depletion of that resource for everyone else.
2. In the scientific method, a hypothesis is:
• A) A proven fact.
• B) An observation made with the five senses.
, • C) A testable explanation for a specific phenomenon.
• D) The final step in an experiment.
• Answer: C
• Rationale: A hypothesis must be a tentative, testable, and falsifiable statement that
attempts to explain an observation.
3. Which law of thermodynamics states that energy cannot be created or destroyed, only
transformed?
• A) First Law of Thermodynamics
• B) Second Law of Thermodynamics
• C) Third Law of Thermodynamics
• D) Law of Conservation of Mass
• Answer: A
• Rationale: The First Law (Law of Conservation of Energy) establishes that the total
energy in an isolated system remains constant.
4. What is the primary product of photosynthesis?
• A) Carbon Dioxide
• B) Nitrogen
• C) Glucose
• D) Methane
• Answer: C
• Rationale: Photosynthesis uses sunlight, water, and CO2 to produce glucose (sugar),
which serves as chemical energy for the plant.
5. Which trophic level contains the most biomass in a healthy ecosystem?
• A) Primary Consumers
• B) Tertiary Consumers
• C) Secondary Consumers
• D) Producers
• Answer: D
, • Rationale: According to the 10% rule, energy and biomass decrease as you move up the
food chain; therefore, producers (plants) always have the highest biomass.
6. Define "Abiotic factor" and provide an example.
• Answer: An abiotic factor is a non-living physical or chemical element in an ecosystem.
Examples include sunlight, temperature, soil pH, or water.
• Rationale: Ecosystems are composed of biotic (living) and abiotic (non-living)
components that interact.
7. Phosphorus is different from carbon and nitrogen cycles because it does not have a:
• A) Liquid phase
• B) Solid phase
• C) Gaseous phase
• D) Biological phase
• Answer: C
• Rationale: The phosphorus cycle is primarily sedimentary; phosphorus does not circulate
through the atmosphere in a significant gaseous form.
8. What process converts atmospheric nitrogen (
𝑁2
) into a form plants can use (
𝑁𝐻3
)?
• A) Denitrification
• B) Nitrogen Fixation
• C) Nitrification
• D) Assimilation
• Answer: B
• Rationale: Nitrogen fixation, often performed by bacteria in soil or legume root nodules,
breaks the strong triple bond of
𝑁2
to create ammonia.
, 9. A group of individuals of the same species living in the same area is a(n):
• A) Community
• B) Ecosystem
• C) Population
• D) Biosphere
• Answer: C
• Rationale: A population is specific to one species in one area; a community includes
multiple species.
10. Which of the following is a "K-selected" species characteristic?
• A) Many small offspring
• B) Little to no parental care
• C) Long life expectancy
• D) Rapid maturation
• Answer: C
• Rationale: K-selected species (like humans or elephants) invest heavily in a few
offspring and generally live longer, more stable lives.
11. The "Competitive Exclusion Principle" states that:
• A) Two species can occupy the exact same niche indefinitely.
• B) Two species competing for the same limiting resource cannot coexist.
• C) Predators always drive prey to extinction.
• D) Competition leads to increased biodiversity.
• Answer: B
• Rationale: If two species compete for the same niche, one will eventually be more
efficient and outcompete the other.
12. What is the definition of "Mutualism"?
• A) One species benefits, the other is harmed.
• B) Both species benefit from the interaction.
• C) One species benefits, the other is unaffected.
– ACTUAL Q&A (STRAIGHTERLINE) (UPDATED PDF)
THIS COMPREHENSIVE EXAM IS DESIGNED TO MIRROR THE CURRICULUM FOUND
IN ENV 101: ENVIRONMENTAL SCIENCE (STRAIGHTERLINE), COVERING THE
FOUNDATIONAL PRINCIPLES OF ECOLOGY, HUMAN IMPACT, RESOURCE
MANAGEMENT, AND SUSTAINABILITY.
ENV 101: Environmental Science Comprehensive Exam
Table of Contents
1. Section 1: Foundations of Environmental Science & Ecology (Questions 1–25)
2. Section 2: Populations, Biomes, and Agriculture (Questions 26–50)
3. Section 3: Toxicology, Air, and Water Systems (Questions 51–75)
4. Section 4: Energy, Waste, and Policy (Questions 76–100)
Section 1: Foundations of Environmental Science & Ecology
1. Which of the following best describes the "Tragedy of the Commons"?
• A) Private land being overused by the owner.
• B) Shared resources being depleted by individuals acting in their own self-interest.
• C) Government-regulated forests being harvested sustainably.
• D) The extinction of a species due to natural causes.
• Answer: B
• Rationale: The Tragedy of the Commons occurs when individuals use a public resource
(like air, water, or grazing land) for their own benefit without regard for the long-term
depletion of that resource for everyone else.
2. In the scientific method, a hypothesis is:
• A) A proven fact.
• B) An observation made with the five senses.
, • C) A testable explanation for a specific phenomenon.
• D) The final step in an experiment.
• Answer: C
• Rationale: A hypothesis must be a tentative, testable, and falsifiable statement that
attempts to explain an observation.
3. Which law of thermodynamics states that energy cannot be created or destroyed, only
transformed?
• A) First Law of Thermodynamics
• B) Second Law of Thermodynamics
• C) Third Law of Thermodynamics
• D) Law of Conservation of Mass
• Answer: A
• Rationale: The First Law (Law of Conservation of Energy) establishes that the total
energy in an isolated system remains constant.
4. What is the primary product of photosynthesis?
• A) Carbon Dioxide
• B) Nitrogen
• C) Glucose
• D) Methane
• Answer: C
• Rationale: Photosynthesis uses sunlight, water, and CO2 to produce glucose (sugar),
which serves as chemical energy for the plant.
5. Which trophic level contains the most biomass in a healthy ecosystem?
• A) Primary Consumers
• B) Tertiary Consumers
• C) Secondary Consumers
• D) Producers
• Answer: D
, • Rationale: According to the 10% rule, energy and biomass decrease as you move up the
food chain; therefore, producers (plants) always have the highest biomass.
6. Define "Abiotic factor" and provide an example.
• Answer: An abiotic factor is a non-living physical or chemical element in an ecosystem.
Examples include sunlight, temperature, soil pH, or water.
• Rationale: Ecosystems are composed of biotic (living) and abiotic (non-living)
components that interact.
7. Phosphorus is different from carbon and nitrogen cycles because it does not have a:
• A) Liquid phase
• B) Solid phase
• C) Gaseous phase
• D) Biological phase
• Answer: C
• Rationale: The phosphorus cycle is primarily sedimentary; phosphorus does not circulate
through the atmosphere in a significant gaseous form.
8. What process converts atmospheric nitrogen (
𝑁2
) into a form plants can use (
𝑁𝐻3
)?
• A) Denitrification
• B) Nitrogen Fixation
• C) Nitrification
• D) Assimilation
• Answer: B
• Rationale: Nitrogen fixation, often performed by bacteria in soil or legume root nodules,
breaks the strong triple bond of
𝑁2
to create ammonia.
, 9. A group of individuals of the same species living in the same area is a(n):
• A) Community
• B) Ecosystem
• C) Population
• D) Biosphere
• Answer: C
• Rationale: A population is specific to one species in one area; a community includes
multiple species.
10. Which of the following is a "K-selected" species characteristic?
• A) Many small offspring
• B) Little to no parental care
• C) Long life expectancy
• D) Rapid maturation
• Answer: C
• Rationale: K-selected species (like humans or elephants) invest heavily in a few
offspring and generally live longer, more stable lives.
11. The "Competitive Exclusion Principle" states that:
• A) Two species can occupy the exact same niche indefinitely.
• B) Two species competing for the same limiting resource cannot coexist.
• C) Predators always drive prey to extinction.
• D) Competition leads to increased biodiversity.
• Answer: B
• Rationale: If two species compete for the same niche, one will eventually be more
efficient and outcompete the other.
12. What is the definition of "Mutualism"?
• A) One species benefits, the other is harmed.
• B) Both species benefit from the interaction.
• C) One species benefits, the other is unaffected.
