ENV 101 Graded Exam 3 – Environmental Science 2026 UPDA… 2026 Update • Verified Answers
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
ENV 101 Graded Exam 3 – Environmental Science
2026 UPDATE
Actual Exam Questions & Verified Answers
with Detailed Rationales
Document Type: Exam (Elaborations)
Academic Year:
Total Questions: 50 Multiple Choice
Includes: Correct Answers + Full Rationales
Status: Verified & Updated for 2026
Exam (Elaborations) • Actual Questions & Rationales Page 1
,ENV 101 Graded Exam 3 – Environmental Science 2026 UPDA… 2026 Update • Verified Answers
Questions & Verified Answers
1. Which of the following is considered a primary air pollutant?
A. Ozone (O3)
B. Sulfuric Acid (H2SO4)
C. Nitric Acid (HNO3)
D. Carbon Monoxide (CO)
Answer: D
Rationale: Primary pollutants are emitted directly from a source, such as carbon monoxide from vehicle
exhaust, whereas secondary pollutants like ozone form in the atmosphere through chemical reactions. Exam
questions often test the ability to distinguish this concept from closely related distractors, making a clear
rationale essential for mastery.
2. What process is responsible for the increase in the concentration of toxins in organisms at
higher trophic levels?
A. Eutrophication
B. Bioaccumulation
C. Biomagnification
D. Photosynthesis
Answer: C
Rationale: Biomagnification occurs when the concentration of a substance, such as methylmercury or DDT,
increases as it moves up the food chain. Applying this knowledge in clinical settings supports safe,
evidence-based practice and improves patient outcomes. This is an important clinical concept because
selecting the correct answer (C) requires understanding both the pathophysiology and the practical nursing
implications.
3. Which energy source currently accounts for the largest share of global electricity
generation?
A. Nuclear Power
B. Solar Energy
C. Coal
D. Natural Gas
Answer: C
Rationale: While natural gas and renewables are growing, coal remains the single largest source of electricity
globally, though its share varies by region. Applying this knowledge in clinical settings supports safe,
evidence-based practice and improves patient outcomes. This is an important clinical concept because
selecting the correct answer (C) requires understanding both the pathophysiology and the practical nursing
implications.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, ENV 101 Graded Exam 3 – Environmental Science 2026 UPDA… 2026 Update • Verified Answers
4. The ‘Tragedy of the Commons’ refers to:
A. The lack of international laws regarding space exploration.
B. The overproduction of waste in urban areas.
C. The depletion of shared resources by individuals acting in their own self-interest.
D. The failure of private property rights in a capitalist society.
Answer: C
Rationale: Garrett Hardin’s concept describes how individuals, acting independently and rationally according to
each one’s self-interest, behave contrary to the whole group’s long- term best interests by depleting a common
resource. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide
accurate patient education.
5. Which layer of the atmosphere contains the majority of the Earth’s ozone, which protects us
from UV radiation?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Answer: B
Rationale: The stratosphere contains the ‘ozone layer,’ which absorbs the majority of the sun’s harmful
ultraviolet radiation. This is an important clinical concept because selecting the correct answer (B) requires
understanding both the pathophysiology and the practical nursing implications. Recognizing this principle
allows the nurse to prioritize care, anticipate complications, and provide accurate patient education.
6. Which of the following is a non-point source of water pollution?
A. A factory discharge pipe
B. An active oil well leak
C. Runoff from agricultural fields
D. A sewage treatment plant outlet
Answer: C
Rationale: Non-point source pollution comes from diffuse sources, such as rainfall or snowmelt moving over
the ground and picking up pollutants, unlike point sources which have a specific discharge point. Exam
questions often test the ability to distinguish this concept from closely related distractors, making a clear
rationale essential for mastery.
Exam (Elaborations) • Actual Questions & Rationales Page 3
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
ENV 101 Graded Exam 3 – Environmental Science
2026 UPDATE
Actual Exam Questions & Verified Answers
with Detailed Rationales
Document Type: Exam (Elaborations)
Academic Year:
Total Questions: 50 Multiple Choice
Includes: Correct Answers + Full Rationales
Status: Verified & Updated for 2026
Exam (Elaborations) • Actual Questions & Rationales Page 1
,ENV 101 Graded Exam 3 – Environmental Science 2026 UPDA… 2026 Update • Verified Answers
Questions & Verified Answers
1. Which of the following is considered a primary air pollutant?
A. Ozone (O3)
B. Sulfuric Acid (H2SO4)
C. Nitric Acid (HNO3)
D. Carbon Monoxide (CO)
Answer: D
Rationale: Primary pollutants are emitted directly from a source, such as carbon monoxide from vehicle
exhaust, whereas secondary pollutants like ozone form in the atmosphere through chemical reactions. Exam
questions often test the ability to distinguish this concept from closely related distractors, making a clear
rationale essential for mastery.
2. What process is responsible for the increase in the concentration of toxins in organisms at
higher trophic levels?
A. Eutrophication
B. Bioaccumulation
C. Biomagnification
D. Photosynthesis
Answer: C
Rationale: Biomagnification occurs when the concentration of a substance, such as methylmercury or DDT,
increases as it moves up the food chain. Applying this knowledge in clinical settings supports safe,
evidence-based practice and improves patient outcomes. This is an important clinical concept because
selecting the correct answer (C) requires understanding both the pathophysiology and the practical nursing
implications.
3. Which energy source currently accounts for the largest share of global electricity
generation?
A. Nuclear Power
B. Solar Energy
C. Coal
D. Natural Gas
Answer: C
Rationale: While natural gas and renewables are growing, coal remains the single largest source of electricity
globally, though its share varies by region. Applying this knowledge in clinical settings supports safe,
evidence-based practice and improves patient outcomes. This is an important clinical concept because
selecting the correct answer (C) requires understanding both the pathophysiology and the practical nursing
implications.
Exam (Elaborations) • Actual Questions & Rationales Page 2
, ENV 101 Graded Exam 3 – Environmental Science 2026 UPDA… 2026 Update • Verified Answers
4. The ‘Tragedy of the Commons’ refers to:
A. The lack of international laws regarding space exploration.
B. The overproduction of waste in urban areas.
C. The depletion of shared resources by individuals acting in their own self-interest.
D. The failure of private property rights in a capitalist society.
Answer: C
Rationale: Garrett Hardin’s concept describes how individuals, acting independently and rationally according to
each one’s self-interest, behave contrary to the whole group’s long- term best interests by depleting a common
resource. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide
accurate patient education.
5. Which layer of the atmosphere contains the majority of the Earth’s ozone, which protects us
from UV radiation?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Answer: B
Rationale: The stratosphere contains the ‘ozone layer,’ which absorbs the majority of the sun’s harmful
ultraviolet radiation. This is an important clinical concept because selecting the correct answer (B) requires
understanding both the pathophysiology and the practical nursing implications. Recognizing this principle
allows the nurse to prioritize care, anticipate complications, and provide accurate patient education.
6. Which of the following is a non-point source of water pollution?
A. A factory discharge pipe
B. An active oil well leak
C. Runoff from agricultural fields
D. A sewage treatment plant outlet
Answer: C
Rationale: Non-point source pollution comes from diffuse sources, such as rainfall or snowmelt moving over
the ground and picking up pollutants, unlike point sources which have a specific discharge point. Exam
questions often test the ability to distinguish this concept from closely related distractors, making a clear
rationale essential for mastery.
Exam (Elaborations) • Actual Questions & Rationales Page 3
