ENV 101 Environmental Science Graded Exam 2 2026 UPDATE 2026 Update • Verified Answers
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
ENV 101 Environmental Science Graded Exam 2
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 Environmental Science Graded Exam 2 2026 UPDATE 2026 Update • Verified Answers
Questions & Verified Answers
1. Which of the following best defines the term ‘carrying capacity’ in an ecosystem?
A. The minimum number of individuals needed to prevent extinction.
B. The total number of species living within a specific geographical area.
C. The rate at which energy is captured by producers through photosynthesis.
D. The maximum number of individuals of a species that an environment can support indefinitely.
Answer: D
Rationale: Carrying capacity refers to the limit of a population size that a particular environment can sustain
based on available resources like food, water, and habitat. Recognizing this principle allows the nurse to
prioritize care, anticipate complications, and provide accurate patient education.
2. In the demographic transition model, what characterizes the ‘transitional’ stage (Stage 2)?
A. High birth rates and rapidly declining death rates leading to high population growth.
B. Low birth rates and low death rates resulting in slow growth.
C. High birth rates and high death rates resulting in stable population.
D. Declining birth rates and low death rates leading to zero population growth.
Answer: A
Rationale: During the transitional stage, improvements in healthcare and sanitation lower death rates, while
birth rates remain high, leading to rapid population increase. Applying this knowledge in clinical settings
supports safe, evidence-based practice and improves patient outcomes.
3. Which process in the nitrogen cycle converts atmospheric nitrogen (N2) into ammonia
(NH3)?
A. Denitrification
B. Nitrification
C. Nitrogen fixation
D. Assimilation
Answer: C
Rationale: Nitrogen fixation is the process, often performed by bacteria in soil or root nodules, that converts
gaseous nitrogen into forms usable by plants. 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 Environmental Science Graded Exam 2 2026 UPDATE 2026 Update • Verified Answers
4. What is the primary cause of ocean acidification?
A. Agricultural runoff containing high levels of nitrogen.
B. Oil spills and industrial waste dumping.
C. Increased absorption of carbon dioxide (CO2) from the atmosphere.
D. Thermal pollution from power plants.
Answer: C
Rationale: When CO2 is absorbed by seawater, it reacts to form carbonic acid, which lowers the pH of the
ocean. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide
accurate patient education. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery.
5. A ‘keystone species’ is one that:
A. Is the most abundant species in a community.
B. Has a disproportionately large effect on its environment relative to its abundance.
C. Is at the very bottom of the food chain.
D. Is a non-native species that disrupts the ecosystem.
Answer: B
Rationale: Keystone species play a critical role in maintaining the structure of an ecological community, and
their removal can cause a collapse of the ecosystem. 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 considered a non-point source of water pollution?
A. A specific discharge pipe from a factory.
B. Runoff from agricultural fields across a region.
C. A leak from a sewage treatment plant.
D. An oil tanker spill in the harbor.
Answer: B
Rationale: Non-point source pollution comes from diffuse sources rather than a single, identifiable point. 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.
Exam (Elaborations) • Actual Questions & Rationales Page 3
✓ VERIFIED • 2026 UPDATE • 100% ACCURATE
ENV 101 Environmental Science Graded Exam 2
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 Environmental Science Graded Exam 2 2026 UPDATE 2026 Update • Verified Answers
Questions & Verified Answers
1. Which of the following best defines the term ‘carrying capacity’ in an ecosystem?
A. The minimum number of individuals needed to prevent extinction.
B. The total number of species living within a specific geographical area.
C. The rate at which energy is captured by producers through photosynthesis.
D. The maximum number of individuals of a species that an environment can support indefinitely.
Answer: D
Rationale: Carrying capacity refers to the limit of a population size that a particular environment can sustain
based on available resources like food, water, and habitat. Recognizing this principle allows the nurse to
prioritize care, anticipate complications, and provide accurate patient education.
2. In the demographic transition model, what characterizes the ‘transitional’ stage (Stage 2)?
A. High birth rates and rapidly declining death rates leading to high population growth.
B. Low birth rates and low death rates resulting in slow growth.
C. High birth rates and high death rates resulting in stable population.
D. Declining birth rates and low death rates leading to zero population growth.
Answer: A
Rationale: During the transitional stage, improvements in healthcare and sanitation lower death rates, while
birth rates remain high, leading to rapid population increase. Applying this knowledge in clinical settings
supports safe, evidence-based practice and improves patient outcomes.
3. Which process in the nitrogen cycle converts atmospheric nitrogen (N2) into ammonia
(NH3)?
A. Denitrification
B. Nitrification
C. Nitrogen fixation
D. Assimilation
Answer: C
Rationale: Nitrogen fixation is the process, often performed by bacteria in soil or root nodules, that converts
gaseous nitrogen into forms usable by plants. 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 Environmental Science Graded Exam 2 2026 UPDATE 2026 Update • Verified Answers
4. What is the primary cause of ocean acidification?
A. Agricultural runoff containing high levels of nitrogen.
B. Oil spills and industrial waste dumping.
C. Increased absorption of carbon dioxide (CO2) from the atmosphere.
D. Thermal pollution from power plants.
Answer: C
Rationale: When CO2 is absorbed by seawater, it reacts to form carbonic acid, which lowers the pH of the
ocean. Recognizing this principle allows the nurse to prioritize care, anticipate complications, and provide
accurate patient education. Exam questions often test the ability to distinguish this concept from closely related
distractors, making a clear rationale essential for mastery.
5. A ‘keystone species’ is one that:
A. Is the most abundant species in a community.
B. Has a disproportionately large effect on its environment relative to its abundance.
C. Is at the very bottom of the food chain.
D. Is a non-native species that disrupts the ecosystem.
Answer: B
Rationale: Keystone species play a critical role in maintaining the structure of an ecological community, and
their removal can cause a collapse of the ecosystem. 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 considered a non-point source of water pollution?
A. A specific discharge pipe from a factory.
B. Runoff from agricultural fields across a region.
C. A leak from a sewage treatment plant.
D. An oil tanker spill in the harbor.
Answer: B
Rationale: Non-point source pollution comes from diffuse sources rather than a single, identifiable point. 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.
Exam (Elaborations) • Actual Questions & Rationales Page 3
