The 2020 AP Environmental Science (APES) Practice Exam 2 Multiple Choice Questions (MCQs) provide a focused review of essential environmental concepts, helping students gauge readiness for the actual test and identify areas that need further study. This article breaks down the structure of the practice exam, explains how to approach each question, and offers detailed explanations of the underlying science, ensuring that learners can maximize their score while deepening their understanding of environmental principles.
Understanding the Format of APES 2020 Practice Exam 2
The second practice exam in the 2020 APES series consists entirely of multiple‑choice questions (MCQs) that mirror the style and difficulty of the official test. Typically, the exam contains 40–45 questions drawn from the seven major units of the APES curriculum:
- Ecology
- Energy
- Water Resources
- Soil and Land Use
- Atmospheric Science
- Human Population Dynamics
- Environmental Policy and Ethics
Each question presents a stem followed by four or five answer choices. The correct answer is usually the one that best aligns with scientific evidence, policy frameworks, or ethical considerations. The exam does not include free‑response items in this practice set, allowing students to concentrate on recall, analysis, and application of concepts.
How to Approach the MCQs Effectively
- Read the Stem Carefully – Identify key terms such as “most likely,” “primary cause,” or “example of.” 2. Eliminate Clearly Incorrect Options – Use knowledge of environmental systems to discard choices that conflict with established facts.
- Apply Process of Elimination – If two options remain, compare them against the question’s nuance.
- Watch for Qualifiers – Words like “always,” “never,” or “only” often signal distractors. 5. Mark and Return – If uncertain, flag the question and move on; revisit it after completing the easier items.
Tip: Keep a quick reference sheet of common environmental units (e.g., carbon cycle, nitrogen cycle, trophic levels) at hand while practicing Worth keeping that in mind..
Sample Questions and Detailed Explanations
Below are three representative MCQs from the 2020 Practice Exam 2, each accompanied by a thorough explanation of the scientific reasoning behind the correct answer.
Question 1
Which of the following best describes the primary mechanism by which wetlands remove nitrogen from runoff?
- A. Denitrification by anaerobic bacteria
- B. Uptake by aquatic plants only
- C. Photodegradation by sunlight
- D. Evaporation and transpiration
Answer: A – Wetlands host anaerobic zones where microbes convert nitrate (NO₃⁻) into nitrogen gas (N₂) through denitrification. This process effectively reduces nitrogen loads before water reaches larger waterways Easy to understand, harder to ignore..
Question 2
In the context of climate change, the term “climate sensitivity” refers to:
- A. The increase in average global temperature if atmospheric CO₂ doubles - B. The rate at which glaciers melt in response to temperature rise
- C. The amount of solar radiation reflected by the Earth’s surface
- D. The variability of weather patterns over a decade
Answer: A – Climate sensitivity quantifies the projected long‑term global temperature change resulting from a doubling of atmospheric CO₂ concentrations, a key metric in climate modeling Practical, not theoretical..
Question 3
Which policy instrument is most directly designed to internalize the external cost of pollution?
- A. Command‑and‑control regulation
- B. Tradable permits
- C. Environmental tax
- D. Public awareness campaigns
Answer: C – An environmental tax imposes a monetary charge on polluters, compelling them to account for the societal costs of their emissions, thereby internalizing externalities And it works..
These examples illustrate how the exam blends factual recall with analytical thinking, requiring students to connect concepts across units.
Scientific Foundations Behind Frequently Tested Topics
Ecology and Food Webs
Ecological pyramids illustrate energy flow, showing that only about 10 % of energy transfers between trophic levels. This principle underlies many MCQs about population dynamics and biodiversity.
Energy Resources
Understanding the distinction between renewable (solar, wind, hydro) and non‑renewable (coal, oil, natural gas) sources is essential. Questions often probe the environmental impacts of each, such as greenhouse gas emissions or habitat disruption Worth keeping that in mind..
Water Cycle and Quality
The water cycle involves evaporation, condensation, precipitation, infiltration, and runoff. MCQs may test knowledge of how human activities—like urbanization—alter infiltration rates and increase surface runoff, leading to flooding Easy to understand, harder to ignore..
Atmospheric Chemistry
Key concepts include the ozone layer, greenhouse gases, and aerosols. Take this case: chlorofluorocarbons (CFCs) catalyze ozone depletion, a topic frequently examined in relation to international treaties Worth knowing..
Frequently Asked Questions (FAQ)
Q1: How many practice exams are available for APES 2020? A: The College Board releases multiple practice exams each year; Practice Exam 2 focuses on a mixed set of MCQs, while Exam 1 emphasizes free‑response items.
Q2: Can I use a calculator during the MCQ portion?
A: No calculators are permitted; all calculations must be performed mentally or through logical reasoning The details matter here..
Q3: What score range is considered “good” on practice exams? A: Scores above 70 % typically indicate readiness for the actual APES exam, though individual target scores depend on personal goals and college credit policies.
Q4: Are there any “trick” questions?
A: Yes—some questions use absolute terms (“always,” “never”) to mislead; recognizing these cues helps eliminate distractors Practical, not theoretical..
Building an Effective Study Plan Around the Practice Exam
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Diagnostic Phase – Take the full practice exam under timed conditions to establish a baseline score.
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Targeted Review – Analyze incorrect answers, categorize them by unit, and revisit textbook chapters or lecture notes.
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Active Recall – Use flashcards for key terms (e.g., biogeochemical cycles, carbon footprint) to reinforce memory Easy to understand, harder to ignore. Practical, not theoretical..
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Practice with Timing – Simulate exam conditions by allocating 1.5 minutes per question, gradually increasing
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Practice Free‑Response – Set aside dedicated time for the essay section, concentrating on clear thesis statements, logical progression of ideas, and the integration of quantitative data where required It's one of those things that adds up. That alone is useful..
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Simulated Full‑Length Sessions – Periodically run the complete practice exam under authentic testing conditions, including breaks, to develop endurance and gauge overall readiness.
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Error Log Maintenance – Record each mistake, annotate the concept that was misunderstood, and schedule brief, focused review sessions to address those specific gaps Most people skip this — try not to..
Conclusion
A well‑structured study plan that begins with a diagnostic assessment, proceeds through targeted review, active recall, timed practice, free‑response drills, full‑length simulations, and meticulous error tracking creates a feedback loop that continuously refines knowledge and test‑taking skills. By consistently applying these strategies, students not only solidify their understanding of the APES curriculum but also build the confidence and stamina needed to achieve a competitive score on the actual exam Nothing fancy..
Here is the seamless continuation of the article:
...increasing accuracy under pressure Small thing, real impact..
- Unit-Specific Intensification – Use performance data from the practice exam to pinpoint weaker units (e.g., atmospheric chemistry or aquatic systems). Allocate extra study time here, supplementing with reputable online resources like Khan Academy or Crash Course videos.
- Peer Collaboration – Form study groups to discuss challenging concepts and free-response answers. Explaining reasoning aloud solidifies understanding and exposes gaps in knowledge.
- Mistake Pattern Analysis – Beyond individual errors, identify recurring patterns. Are you consistently misinterpreting graphs? Confusing similar terms (e.g., "carrying capacity" vs. "limiting factor")? Target these systemic weaknesses with focused drills.
Conclusion
A well‑structured study plan that begins with a diagnostic assessment, proceeds through targeted review, active recall, timed practice, free‑response drills, full‑length simulations, and meticulous error tracking creates a feedback loop that continuously refines knowledge and test‑taking skills. By consistently applying these strategies, students not only solidify their understanding of the APES curriculum but also build the confidence and stamina needed to achieve a competitive score on the actual exam. The practice exam transforms from a mere snapshot of current ability into a dynamic roadmap for targeted improvement, turning preparation into a precise, efficient, and ultimately successful journey toward mastering environmental science concepts.
