AP Environmental Science FRQ Room

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AP Environmental Science Free Response Questions

The best way to get better at FRQs is practice. Browse through dozens of practice AP Environmental Science FRQs to get ready for the big day.

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  • Unit 1: The Living World: Ecosystems (31)
  • Unit 2: The Living World: Biodiversity (22)
  • Unit 3: Populations (26)
  • Unit 4: Earth Systems and Resources (29)
  • Unit 5: Land and Water Use (19)
  • Unit 6: Energy Resources and Consumption (30)
  • Unit 7: Atmospheric Pollution (52)
  • Unit 8: Aquatic and Terrestrial Pollution (20)
  • Unit 9: Global Change (21)
Unit 1: The Living World: Ecosystems

Agricultural Runoff and Wetland Degradation

Environmental scientists have studied how agricultural practices affect wetland water quality. The t

Medium

Analysis of Aquatic Food Web Structures

Aquatic ecosystems often have complex food webs characterized by unusual biomass distributions. A ta

Medium

Assessing Nitrogen Fertilizer Impact on Ecosystems

Intensive agriculture in a watershed has led to doubling the available fixed nitrogen. A graph is pr

Extreme

Biodiversity Loss in Temperate Forests Under Climate Change

A media article claims that rising temperatures have led to significant declines in species diversit

Extreme

Biomass Disparity in Aquatic Energy Pyramids

An aquatic ecosystem exhibits an unusual biomass pyramid where the consumer biomass exceeds the prod

Medium

Biomass Pyramid Analysis in a Temperate Forest

A temperate forest has been surveyed, and the following biomass data were obtained: primary producer

Easy

Biomass vs. Energy Pyramids in Aquatic Ecosystems

In many aquatic ecosystems, biomass pyramids appear inverted, though energy pyramids always maintain

Hard

Carbon Cycle Disruptions due to Deforestation

Deforestation can significantly alter the carbon cycle in terrestrial ecosystems. Using the data pro

Hard

Carbon Cycling and Net Primary Production in a Forest

In a forest ecosystem, the Gross Primary Production (GPP) is measured at 2000 g C/m²/year and ecosys

Easy

Carbon Sink Capacity and Atmospheric CO2 Increase

Understanding carbon sinks is critical to evaluating global climate change. A table of major carbon

Hard

Deforestation Effects on Atmospheric CO₂

A long-term study in a tropical region documented changes in atmospheric CO₂ levels before and after

Medium

Ecosystem Interactions and Niche Differentiation

A field study in a temperate forest examines two rodent species – a generalist and a specialist. The

Medium

Effectiveness of Riparian Buffers in Reducing River Pollution

A study claims that riparian buffer zones significantly reduce nutrient pollution (nitrogen and phos

Medium

Energy Transfer and the 10% Rule in a Trophic Pyramid

In a marine ecosystem, the primary producers capture 5000 kcal/m² of energy. According to the 10% ru

Easy

Evaluating Human Impact on Wetlands

The ecological services provided by wetlands are significantly affected by human activities. The tab

Hard

FRQ 6: Water Quality Trends and Aquifer Depletion Table Analysis

Examine the provided table that displays groundwater levels, pumping rates, and signs of aquifer dep

Medium

FRQ 7: Trophic Pyramid Energy Flow Analysis

Interpret the energy pyramid diagram provided. In your answer, describe how energy diminishes at eac

Easy

Generalists vs. Specialists: Adaptation Strategies

A case study in a variable environment describes two species: one that is a generalist capable of ut

Easy

Hydrologic Cycle Disruption through Groundwater Depletion

A recent report asserts that intensive agricultural pumping has resulted in a significant drop in gr

Medium

Impact of Invasive Species on Aquatic Ecosystems

An invasive aquatic species has rapidly spread in a lake, disrupting native food webs and leading to

Hard

Integrated Ecosystem Sustainability Analysis Under Anthropogenic Pressure

Environmental scientists are evaluating the long-term sustainability of an ecosystem that is experie

Extreme

Invasive Species and Biodiversity Loss

Explore the impacts of invasive species on native ecosystems and discuss the mechanisms by which the

Medium

Microbial Decomposition and Carbon Release Experiment

Design a laboratory experiment to test how soil moisture influences microbial decomposition rates an

Medium

Nutrient Enrichment and Eutrophication in Aquatic Systems

Researchers studied the relationship between nutrient concentration and algal bloom intensity in a f

Medium

Phosphorus Cycle Modification Due to Agricultural Runoff

A study suggests that agricultural runoff significantly increases phosphorus concentrations in nearb

Hard

Phosphorus Limitation and Its Ecological Effects

Phosphorus is often a limiting nutrient in terrestrial ecosystems due to its low concentration and s

Easy

Photosynthetic Efficiency and Light Intensity

A laboratory study measured the oxygen production rate of aquatic plants under varying light intensi

Medium

Restoration Effectiveness in Mangrove Ecosystems Post Oil Spill

A study claims that restoration efforts in mangrove ecosystems following an oil spill have significa

Hard

Seasonal Turnover in Lake Stratification

A temperate lake exhibits clear seasonal changes in thermal stratification. A graph provided shows t

Medium

Urbanization Impact on Local Climate and Vegetation

A recent urban study claims that urbanization increases local temperatures while reducing native veg

Extreme

Water Distribution and Freshwater Renewal Rates

A hydrologist compiled data on the average renewal rates for different water sources. The table belo

Easy
Unit 2: The Living World: Biodiversity

Adaptations in Changing Environments: Behavioral vs. Physiological Strategies

A study investigates how urban noise pollution affects bird populations by comparing urban and rural

Medium

Assessing the Impact of Urbanization on Air Quality and Indicator Species

Urban air pollution can be assessed indirectly by monitoring the health of indicator species such as

Medium

Assessing the Role of Keystone Species in Maintaining Ecosystem Structure

In a marine mesocosm experiment, researchers remove the sea star—a keystone predator—from some enclo

Hard

Comparative Adaptations for Temperature Extremes

A study compares two species that inhabit extreme temperature regimes. The table below summarizes st

Medium

Comparing Crop Yields Under Monoculture and Polyculture Systems

Researchers compared crop yields in adjacent fields managed under monoculture and polyculture system

Medium

Conservation Strategies for Biodiversity Preservation

This question focuses on developing a comprehensive conservation strategy to preserve biodiversity a

Extreme

Cultural Ecosystem Services and Community Well-being

Cultural ecosystem services, such as recreation and aesthetic value, contribute significantly to com

Easy

Deforestation and Its Long-term Impacts on Biodiversity

A researcher examines the effects of deforestation on biodiversity in a tropical forest by comparing

Medium

Ecosystem Services Evaluation

Ecosystems provide a variety of services that benefit human societies. Consider cultural, provisioni

Medium

FRQ 1: Biodiversity and Ecosystem Resilience

A researcher investigates the relationships among various factors affecting ecosystem biodiversity a

Medium

FRQ 8: Sea Level Changes and Coastal Ecosystem Dynamics

Researchers study global sea level changes over the past century and their impacts on coastal ecosys

Medium

Habitat Fragmentation and Island Biogeography in a Fragmented Landscape

Analyze how habitat fragmentation can be understood through the lens of island biogeography theory.

Extreme

Habitat Loss and Specialist Species

Humans are fragmenting habitats, which affects species differently. Analyze how habitat loss impacts

Medium

Indicator and Keystone Species in Ecosystems

Understanding the roles of indicator and keystone species is vital for monitoring ecosystem health.

Medium

Indicator Species as Environmental Monitors

Indicator species provide early signs of environmental changes. Discuss their role and give examples

Easy

Interpreting a Successional Stages Table: A Visual Analysis

This question requires you to interpret a table comparing early and late successional stages in plan

Hard

Long-term vs. Short-term Adaptations and Genetic Diversity

Adaptations can be short-term or long-term, affecting genetic diversity over time. Explore these dif

Hard

Migratory Patterns and Temperature

Recent studies suggest that wildlife migration distances can be influenced by average temperature. A

Easy

Monitoring the Effects of Sea Level Rise on Coastal Ecosystems

Coastal ecosystems are significantly impacted by sea level rise. Design a long-term study to measure

Hard

Temperature Effects on Ecosystem Productivity and Biodiversity

This question investigates the effects of temperature changes on ecosystem productivity and species

Hard

Urban Green Spaces and Air Quality Improvement

A study was conducted at several urban sites to evaluate the impact of green space density on local

Medium

Urbanization Impact on Local Species Richness

In an urban ecology study, researchers compare species richness in fragmented urban parks versus con

Medium
Unit 3: Populations

Adaptability in Species: Generalists vs Specialists

Examine the traits of generalist and specialist species as provided in the stimulus table. Answer th

Medium

Analyzing Total Fertility Rate (TFR) Trends

Examine the provided table listing TFR values for various countries and interpret the socio-economic

Medium

Assessing Carrying Capacity in a Microcosm Experiment

Design an experiment to measure the carrying capacity (K) in a controlled microcosm environment by v

Medium

Carrying Capacity and Ecosystem Regulation

Discuss the concept of carrying capacity and its role in regulating population sizes within an ecosy

Hard

Carrying Capacity and Environmental Constraints

Analyze a graph showing fluctuations in population size around the carrying capacity of an environme

Medium

Comparing r-selected and K-selected Reproductive Strategies

Discuss the differences between r-strategists and K-strategists in terms of their reproductive strat

Medium

Demographic Transition Model Analysis

Discuss the demographic transition model and analyze its implications for future population trends a

Medium

Density-Dependent vs Density-Independent Limiting Factors

Differentiate between density-dependent and density-independent factors and apply this understanding

Medium

Evaluating Population Dispersal Patterns in Plants

Design an experiment to investigate how different resource distribution patterns affect the dispersa

Medium

Feedback Loops in Ecosystem Dynamics

Evaluate the role of feedback loops in maintaining or disrupting ecosystem stability.

Medium

FRQ 1: Effects of Environmental Change on Generalist and Specialist Species

Researchers examined two populations – one consisting of a generalist species and the other of a spe

Medium

FRQ 4: Carrying Capacity and Environmental Regulation

This question investigates the concept of carrying capacity (K) and involves analyzing population fl

Hard

FRQ 4: Investigating Reproductive Strategies in K-Selected vs r-Selected Rodent Species

An experiment was designed to compare the reproductive outputs of two rodent species, one classified

Hard

FRQ 6: Feedback Loops in Ecosystems

This question focuses on feedback loops in ecosystems, asking you to define them and apply your unde

Medium

FRQ 10: Analyzing Historical Human Population Growth Trends

Historical data shows significant surges in human population growth at different eras. Use the table

Hard

FRQ 16: Population Dispersal Patterns and Resource Distribution

A field study observed the dispersal patterns of organisms in three different plots. The following t

Easy

FRQ 20: Response to Environmental Constraints: Species Distribution Analysis

In a biogeographical study, two species (Alpha and Beta) were compared based on environmental tolera

Extreme

Generalists vs. Specialists in Changing Environments

Consider the following statements about generalist and specialist species: Generalists utilize a var

Medium

Historical Trends in Human Population Growth

Examine the major milestones in human population growth from pre-agricultural times to the modern er

Hard

Interpreting Survivorship Curves

Examine the attached graph depicting survivorship curves and interpret the implications for populati

Medium

Interpreting Survivorship Curves

Examine the survivorship curves in the provided graph and discuss their implications for species' re

Medium

Population Density and Environmental Impact Calculation

Population density is an important indicator of potential environmental stress. Answer the following

Easy

Population Dispersal Patterns

Using the concept of population dispersal patterns, analyze how organisms distribute themselves in h

Easy

Population Growth Models: J-Curve vs. S-Curve

Examine the growth patterns of populations as represented by J-curves and S-curves, and determine th

Hard

Population Growth Models: J-Curves vs. S-Curves

Population growth can follow different models. Consider the two models below and answer the followin

Medium

Population Growth Rate Calculations and Implications

Examine the formula for percent rate of change and apply it to calculate population growth. Discuss

Medium
Unit 4: Earth Systems and Resources

Albedo Measurement Experiment to Study Urban Heat Islands

An environmental scientist performed an experiment to investigate the role of albedo in influencing

Medium

Atmospheric Composition Change Over Geological Time

Earth's atmosphere has evolved significantly over billions of years. Analyze a graph showing oxygen

Medium

Atmospheric Evolution and the Great Oxidation Event

An atmospheric scientist is studying the changes in Earth’s atmosphere that occurred during the Grea

Hard

Continental Drift Fossil Correlation Experiment

A geologist attempted to validate the theory of continental drift by comparing fossil records from s

Hard

Coriolis Effect and Global Wind Trajectories

Analyze the influence of Earth’s rotation on global wind patterns and assess the role of the Corioli

Medium

Effect of Sunlight Angle on Surface Temperature Distribution

Develop an experimental study using a solar simulator to investigate how the angle of incidence of s

Medium

Evaluating Land Use Impacts on Water Quality in a Watershed

A study of a watershed yields the following data regarding phosphorus levels in different sections c

Extreme

Global Warming and its Effects on Coral Reefs

Rising ocean temperatures due to global warming are threatening coral reef ecosystems. Analyze the i

Extreme

Greenhouse Effect: Radiative Forcing due to CO₂ Increase

The radiative forcing due to changes in CO₂ concentration can be approximated by the formula: $$\Del

Medium

Greenhouse Gases and Earth's Atmosphere

This question evaluates your knowledge of atmospheric composition and the role of greenhouse gases.

Easy

Human Land Use Practices and Soil Erosion

Human activities such as deforestation and improper plowing can accelerate soil erosion. Assess the

Medium

Hurricane Energy: Estimating Latent Heat Release

Hurricanes release a tremendous amount of energy primarily through the condensation of water vapor.

Hard

Impact of Fertilizer Runoff on Nutrient Cycles

Fertilizer application can enhance crop yields but also lead to nutrient runoff affecting surroundin

Easy

Impacts of Agricultural Practices on Soil Erosion

A study measured soil erosion rates under different agricultural practices. The table below presents

Medium

Impacts of Atmospheric Composition Changes on Climate

Changes in Earth's atmospheric composition have profound impacts on climate. Analyze the historical

Hard

Integrative Analysis of Land and Water Use Impacts on Ecosystems

This integrative question requires you to synthesize information from multiple environmental systems

Extreme

Mountain Formation at Plate Boundaries

Using the example of the Cascade Mountain Range, this question requires you to explain mountain buil

Hard

Plate Boundary Interactions: Convergence, Divergence, and Transform Boundaries

Investigate the interactions at various plate boundaries, and discuss how these interactions contrib

Medium

Plate Tectonics and Continental Drift Analysis

This question assesses your understanding of plate tectonic theory and the evidence for continental

Medium

Plate Tectonics and Continental Drift Analysis

Examine the theory of plate tectonics and its relationship to continental drift. Refer to the attach

Medium

Plate Tectonics and Seismic Hazard Assessment

This question relates plate tectonic theory to seismic hazard assessment in urban areas.

Hard

Predictability of Monsoon Rains

A meteorological report claims that monsoon rains are entirely predictable based solely on seasonal

Medium

Simulating the Coriolis Effect on Wind Trajectories

Design an experiment using a rotating platform to simulate how the Coriolis effect influences the tr

Extreme

Simulation of Tropical Cyclone Formation and Intensification

Design a simulation-based experiment to study the conditions that lead to the formation and intensif

Extreme

Soil Food Web and Nutrient Cycling

The soil food web is essential for nutrient recycling in ecosystems. Explore how disruptions in the

Hard

Watershed Dynamics and Nutrient Runoff

Evaluate how watershed management strategies influence nutrient runoff and overall water quality in

Hard

Watershed Management and Nutrient Runoff

The following table presents nitrate concentrations (in mg/L) in runoff water from different land ma

Medium

Watershed Management: Calculating Nutrient Runoff

Nutrient runoff from a watershed can be estimated by the equation $$L = C * Q$$, where $$C$$ is the

Medium

Wind Pattern and the Coriolis Effect

A table below summarizes observed wind patterns in different regions: | Region | Observ

Medium
Unit 5: Land and Water Use

Air Pollution and the Tragedy of the Commons

A researcher investigates the relationship between unregulated industrial emissions and air quality

Medium

CAFO Wastewater and Nitrogen Loading

A CAFO with 500 animals produces manure with a soluble nitrogen content of 0.15 kg per animal per da

Hard

Comparative Study on Drip vs. Spray Irrigation Efficiency

A study compares drip irrigation with spray irrigation to evaluate their impact on water usage and c

Medium

Comparing Tillage vs. No-till Agriculture on Soil Health

The table below compares soil organic matter and erosion rates between conventional tillage and no-t

Easy

Ecological Footprint and Resource Use

A researcher aims to quantify the ecological footprint of a city using the IPAT formula $$I = P \tim

Hard

Environmental Impact of CAFOs

Investigate the environmental issues associated with Concentrated Animal Feeding Operations (CAFOs),

Hard

Evaluating the Effects of Overfishing on Marine Food Web Dynamics

Design an experimental simulation to examine how different levels of fishing pressure affect marine

Extreme

Experiment Analysis: GMO vs. Non-GMO Crop Yield Comparison

In a study comparing the yields of GMO and non-GMO corn varieties over a full growing season, resear

Medium

Experiment Analysis: Integrated Pest Management Versus Conventional Pesticide Use

An experiment was designed to compare the effectiveness of Integrated Pest Management (IPM) with con

Medium

Green Revolution and GMO Yield Analysis

Evaluate the impact of the Green Revolution by comparing the performance of GMO and non-GMO crops. U

Medium

Integrated Pest Management (IPM) vs. Chemical Pesticides: Impact on Pest Populations

Design an experiment to compare the effects of Integrated Pest Management (IPM) and chemical pestici

Hard

Meat Production and Sustainable Practices: CAFOs Diagram Analysis

Review the provided diagram that illustrates the process of meat production in CAFOs and its related

Hard

Mining Methods and Their Environmental Impacts

Examine the environmental consequences of different mining techniques and the challenges associated

Hard

Mining: Land Disturbance and Environmental Consequences

Assess the environmental impacts of mining by quantifying land disturbance and discussing related ec

Easy

Pesticide Resistance and IPM Strategies

Investigate the relationship between pesticide use and pest population dynamics, and evaluate how In

Hard

Pesticide Treadmill and Integrated Pest Management (IPM)

Investigate the concept of the pesticide treadmill and evaluate the potential of Integrated Pest Man

Medium

Soil Conservation with No-Till Farming: Carbon Sequestration

No‐till farming is known to increase soil organic carbon by 0.2 tC/ha per year. A farmer converts 10

Hard

Urban Sprawl and Land Use Transformation

Urban sprawl is said to drive the conversion of agricultural lands into urban areas. Evaluate this c

Medium

Urban Sustainability and the IPAT Model

Use the IPAT model to analyze the environmental impact of urban areas and propose strategies to redu

Hard
Unit 6: Energy Resources and Consumption

Advanced Clean Coal Technology

Clean coal technology is designed to reduce the environmental impact of coal combustion. Analyze the

Hard

Biomass Anaerobic Digestion Experiment

In an experiment investigating methane production from biomass waste, a scientist uses an anaerobic

Medium

Biomass Energy and Anaerobic Digestion Efficiency

A study was conducted to evaluate the methane yield from different biomass feedstocks used in anaero

Medium

Biomass Energy Conversion Process

Study the flowchart outlining the biomass energy conversion process. Answer the following:

Medium

Clean Coal Emissions Measurement Experiment

Engineers set up an experiment to simulate clean coal technology by burning pulverized coal in a con

Hard

Clean Coal Technologies and Emission Controls

Clean coal technologies aim to reduce emissions from coal combustion without compromising energy out

Hard

Comparative Analysis of Energy Units

Energy and power can be expressed in various units. Analyze these units and perform conversions betw

Easy

Comparing Solar Thermal and Photovoltaic Systems

Solar energy can be harnessed by either solar thermal collectors or photovoltaic cells. Analyze and

Medium

Designing a Sustainable Community Energy Plan

This question requires you to design a sustainable energy portfolio for a small community by integra

Extreme

Energy Conservation and Thermodynamics

This question explores the principles of energy conservation and thermodynamics. Answer all parts.

Medium

Energy Conversion Efficiency in Nuclear Power Plants

Refer to the diagram depicting the nuclear fission process in a power plant. Answer the following:

Hard

Energy Conversion in Turbine-Generator Systems

Examine the series of energy conversions that occur in a conventional thermal power plant, from fuel

Medium

Energy Units and Conversion Calculations

Understanding energy units is essential in quantifying and comparing energy use. Analyze the differe

Easy

Future Energy Scenarios: Integrating Diverse Energy Sources

Looking forward, the global energy landscape is expected to become increasingly diversified. Evaluat

Extreme

Geothermal Energy Extraction

This question assesses your understanding of geothermal energy extraction methods and the associated

Medium

Greenhouse Gases and Energy Production

Evaluate the impact of different energy production methods on greenhouse gas emissions and propose s

Medium

Hydroelectric Power Efficiency Experiment

A researcher builds a scale model of a dam to study the efficiency of converting the potential energ

Medium

Hydrogen Fuel Cell Operation

Using the diagram provided, answer the following questions about hydrogen fuel cells:

Medium

Hydrogen Fuel Cells Efficiency

Hydrogen fuel cells are considered a promising technology for clean energy production. Examine their

Hard

Lifecycle Environmental Impact Comparison

A lifecycle analysis compares environmental impacts of fossil fuels versus renewable energy sources.

Hard

Nuclear Power and Safety

Nuclear power plants operate on the principle of nuclear fission but come with unique safety challen

Hard

Nuclear Safety and Reactor Design

Study the schematic diagram of a typical nuclear reactor provided below. Answer the following questi

Extreme

Passive Solar Heating Efficiency Experiment

A study is designed to evaluate the efficiency of a building's passive solar heating system by monit

Medium

Residential Energy Conservation Strategies

This question investigates various energy conservation strategies in residential settings and requir

Easy

Residential Energy Conservation Strategies

Reducing energy consumption in residential settings is crucial for sustainability. Evaluate conserva

Easy

Roles of Moderators, Control Rods, and Coolants in Nuclear Reactors

Examine the functions of control rods, moderators, and coolants in maintaining reactor safety in nuc

Medium

Solar Photovoltaic System Diagram Analysis

Examine the provided diagram of a residential solar photovoltaic (PV) system. The diagram shows sola

Medium

Solar Thermal Collector Performance Experiment

Students set up an experiment to test the performance of a solar thermal collector by circulating wa

Hard

Technologies for Emission Control in Fossil Fuel Combustion

Advanced technologies aim to reduce pollutant emissions from fossil fuel power plants. Analyze how t

Hard

Thermal Efficiency Improvement in Buildings

A study measured the monthly energy consumption of a building before and after improvements in insul

Easy
Unit 7: Atmospheric Pollution

Acid Deposition and Ecosystem Impact

This question focuses on the chemical processes of acid deposition and its potential environmental i

Hard

Acid Rain and Ecosystem Impact Assessment

Acid rain has deleterious effects on ecosystems. Evaluate the impact using the provided data and you

Hard

Acid Rain and Soil pH Effects

Design an experiment to evaluate the effects of acid rain deposition on soil pH levels and nutrient

Medium

Air Pollutants Characteristics

This question examines your understanding of primary and secondary air pollutants and their sources.

Medium

Air Pollutants: Industrial Smog and Particulate Matter

Examine the formation process of industrial smog and the behavior of particulate matter in the atmos

Medium

Analysis of Air Pollution Data from a Power Plant

A study measured daily concentrations of sulfur dioxide (SO₂) near an urban power plant. The data we

Medium

Analyzing Photochemical Smog Formation

In an urban area, photochemical smog exhibits a distinct daily cycle. During early morning hours (6

Hard

Analyzing Sources and Types of Air Pollution

This question explores the distinctions among various types of air pollutants. Identify and compare

Easy

Assessing the Impact of Air Pollutants on Human Respiratory Health

Air pollutants such as particulate matter and ozone have significant effects on respiratory health.

Medium

Assessment of Noise Pollution in Urban Areas

An environmental scientist collects data on noise pollution in various urban areas. The table below

Medium

Calculating Acid Deposition from Sulfur Dioxide Emissions

Acid deposition is a significant environmental concern. A power plant emits 5000 grams of sulfur dio

Extreme

Carbon Monoxide Emission Measurement Experiment

A research team is evaluating the effectiveness of catalytic converters in reducing carbon monoxide

Easy

Carbon Monoxide Production and Mitigation

In an urban environment with heavy traffic, high levels of carbon monoxide (CO) have been recorded.

Medium

Catalytic Converters and Emission Reductions

Catalytic converters play a critical role in reducing harmful vehicle emissions. Using the informati

Medium

Catalytic Converters: Mechanism and Effectiveness

Catalytic converters are pivotal in reducing harmful vehicular emissions. Examine the provided diagr

Medium

Comparative Analysis of Industrial and Photochemical Smog

A researcher compares industrial (gray) smog and photochemical (brown) smog regarding their sources,

Hard

Comparing Indoor and Outdoor Air Pollution Dynamics

Indoor and outdoor air pollution have distinct sources and characteristics. Compare these two types

Medium

Determining the Role of Particulate Matter Sources

A study measured the contribution of various sources to suspended particulate matter (PM₁₀) in a met

Easy

Developing a Remediation Strategy for Industrial Air Pollution

Given the variety of methods available to reduce industrial air pollutants (such as switching to low

Hard

Evaluating Air Pollution Mitigation Technologies in Developing Countries

Developing countries often face severe air pollution issues due to rapid urbanization, reliance on t

Extreme

Evaluating Impact of Non-Point Source Pollution on Ecosystem Health

A watershed study measured nitrogen oxide (NOx) deposition across sub-catchments subject to non-poin

Extreme

Evaluating Particulate Matter Effects on Environment and Human Health

Suspended particulate matter (PM) poses risks to both human health and ecosystem integrity. Analyze

Hard

Human Activities and the Evolution of Air Pollution

Air pollution levels and regulatory responses have evolved significantly since the 19th century. Use

Medium

Impact of Peroxyacyl Nitrates (PANs) on Agriculture

A study investigates the influence of peroxyacyl nitrates (PANs) on agricultural crop yields. The ta

Hard

Impact of Renewable Energy on Local Air Quality

Design an experiment to assess the impact of transitioning to renewable energy sources on local air

Easy

Impacts of VOCs on Urban Air Quality

This question examines the role of volatile organic compounds (VOCs) in urban air pollution and stra

Hard

Indoor Air Quality and Sick Building Syndrome

A study measured indoor pollutant levels in different building rooms to assess risks associated with

Easy

Indoor Air Quality: Formaldehyde Concentration Analysis Experiment

In an investigation of indoor air quality, a student deploys passive formaldehyde sampling devices t

Easy

Interconnected Effects of Air Pollution and Climate Change

A long-term study tracks atmospheric concentrations of CO2 and tropospheric ozone over several decad

Extreme

Investigating Ozone Formation in Urban Settings

A researcher studies ozone formation by exposing a mixture of nitrogen oxides and volatile organic c

Medium

Linking Urban Heat Islands to Pollution Concentrations

Urban heat islands can exacerbate air pollution problems. A graph is provided that shows modeled tem

Hard

Mitigation Strategies for Urban Air Pollution

A researcher is tasked with developing strategies to mitigate urban air pollution. Considering vario

Medium

Modeling Air Pollutant Dispersion

A researcher models the dispersion of an air pollutant from a point source using the equation $$y =

Extreme

Nitrogen Oxides: Reaction Mechanisms and Environmental Impact

In an industrial region, high-temperature combustion processes lead to significant emissions of nitr

Hard

Noise Pollution: Assessment and Mitigation Strategies

Noise pollution is an environmental stressor with significant effects on human health. Answer the fo

Medium

Ozone's Impact on Human Health

A study investigates the effects of ground-level ozone on public health. The provided table shows th

Medium

Photochemical Reactions and Ozone Dynamics

Explore the chemical processes leading to ground-level ozone formation and their dependence on UV li

Hard

Photochemical Reactions and Secondary Pollutants Formation

A chemist is investigating the formation of peroxyacyl nitrates (PANs), a secondary pollutant, which

Extreme

Photochemical Smog Diurnal Variation Analysis

This question explores the diurnal variation of photochemical smog and requires analysis of pollutan

Extreme

Photochemical Smog Kinetics and Urban Air Quality

Photochemical smog formation is influenced by the interactions of NOx, VOCs, and sunlight. Analyze k

Hard

Processing Industrial Smog

Industrial smog results from a series of chemical reactions during the combustion of fossil fuels. A

Hard

Reduction of Air Pollution through Policy Measures

Discuss the variety of remediation strategies for reducing air pollution and evaluate the effectiven

Hard

Role of Volcanic Organic Compounds (VOCs) in Air Quality

Volcanic Organic Compounds (VOCs) are natural emissions that can affect air quality. Explain the pro

Hard

Sourcing Air Pollution: Point vs. Non-point

A researcher measures concentrations of NO2, SO2, and PM2.5 in two distinct locations: an industrial

Easy

Sulfur Dioxide and Acid Rain

Detail the chemical transformation of sulfur dioxide into acid rain and evaluate its environmental i

Extreme

Suspended Particulate Matter: Behavior and Impact

Analyze the factors influencing the behavior of suspended particulate matter in the atmosphere and a

Hard

Trade-offs in the Use of Catalytic Converters

A study evaluates the effectiveness of catalytic converters in reducing harmful vehicular emissions.

Medium

Urban Heat Islands and Air Pollutants

This question examines the formation of urban heat islands and their effect on air pollutant dispers

Medium

Urban Heat Islands and Air Pollution Dynamics

Evaluate the interplay between urban heat islands and air pollution levels.

Medium

Urban Heat Islands and Air Pollution Interaction

This question explores the concept of urban heat islands and their impact on air pollution, requirin

Extreme

Urban Lead Sources and Health Risks

Lead is a dangerous pollutant particularly in urban environments. Answer the following: (a) Identif

Medium

Urban versus Rural Particulate Matter Sources

A study compared PM2.5 and PM10 concentrations in urban and rural settings over a one-month period.

Medium
Unit 8: Aquatic and Terrestrial Pollution

Analysis of a Point-Source Pollution Event in a River

Following a discharge from a chemical plant, water samples were collected upstream and downstream of

Medium

Bioaccumulation and Biomagnification in Terrestrial Food Chains

This FRQ investigates the processes of bioaccumulation and biomagnification within terrestrial food

Extreme

Biochemical Oxygen Demand (BOD) as an Indicator of Water Pollution

A researcher is analyzing BOD data from various water sources to assess organic pollution. Answer th

Medium

Biodegradable Wastes and Algal Blooms

This FRQ investigates how biodegradable wastes, particularly nitrates and phosphates, promote algal

Medium

Case Study: Oil Spill Effects on Marine Ecosystems

Oil spills have immediate and long-term detrimental effects on marine ecosystems. This question requ

Medium

Comparative Analysis of Solid Waste Disposal Methods

Municipal solid waste (MSW) management involves various disposal methods. Examine quantitative data

Medium

Cultural Eutrophication and Its Effects

A lake in a suburban area has been showing signs of cultural eutrophication due to increased nutrien

Medium

Effects of Temperature on Metabolic Rates in Aquatic Organisms

This FRQ explores the relationship between water temperature and the metabolic rate in aquatic organ

Easy

Evaluation of Hazardous Waste Management and Isolation Methods

Examine the effectiveness of hazardous waste management strategies with a focus on landfill capping

Hard

Evaluation of Hazardous Waste Storage Methods

Proper hazardous waste management is essential to prevent environmental contamination. Analyze radia

Hard

Field Study: Effects of Urban Runoff on Local Freshwater Biodiversity

Urban runoff can alter the chemical profile of water bodies and affect local biodiversity. Design a

Hard

FRQ8: Mining-Related Water Pollution

Examine the schematic diagram of a mining operation and its associated wastewater flows. Analyze how

Hard

FRQ14: Endocrine Disruptor Analysis: BPA Exposure

Examine the schematic diagram depicting BPA exposure pathways in humans. Analyze the diagram and dis

Hard

Impact of Endocrine Disruptors on Wildlife Reproduction

Data collected from wildlife populations near urban areas indicate abnormalities in reproductive rat

Hard

Impact of Thermal Pollution on Local Fish Populations

A study is conducted near an industrial discharge site where warm water is released into a stream. T

Medium

Mining and Heavy Metal Pollution in Water Bodies

A mining company discharges tailings into a nearby river, resulting in elevated heavy metal concentr

Hard

Oil Spill Impacts and Mitigation

A research team is assessing the ecological effects of an oil spill and evaluating potential mitigat

Medium

Persistent Organic Pollutants (POPs) in Food Chains

This FRQ centers on the accumulation of persistent organic pollutants (POPs) through food chains, ex

Medium

Risks and Management of Radioactive Wastes

Radioactive wastes pose significant long-term hazards. This question analyzes the differences betwee

Hard

Water Quality Testing and Analysis

A research team collected water quality data from two sampling sites along a river. Use the provided

Medium
Unit 9: Global Change

Analyzing Climate Feedback Loops

Climate feedback loops can amplify or dampen the effects of climate forcing. In this final problem,

Extreme

Assessing Energy Supply and its Impact on Greenhouse Gas Emissions

This question explores the significant impact of fossil fuel combustion for energy supply on greenho

Medium

Assessing the Effects of Invasive Species on Marine Ecosystems

A marine ecologist is studying the impact of invasive species on coastal ecosystems, with a focus on

Medium

Assessing the Impact of Global Warming on Weather Patterns

This question addresses how global warming influences the frequency and intensity of extreme weather

Medium

Assessment of Ocean Acidification and Its Impact on Marine Life

Marine scientists are investigating the process of ocean acidification resulting from increased atmo

Hard

Captive Breeding and Habitat Simulation for Endangered Amphibians

A researcher evaluates a captive breeding program for an endangered amphibian species by monitoring

Medium

Climate Change Predictions and Model Robustness

Researchers use mathematical models to predict future climate change by correlating CO₂ concentratio

Hard

Designing Experiments to Study the Effect of UV Radiation on Ozone Formation

This question asks you to design a controlled laboratory experiment to investigate how varying UV ra

Medium

Ecological Consequences of Warming on Vector-Borne Diseases

Changing climate conditions are altering the distribution and abundance of vectors such as mosquitoe

Medium

Endangered Species: An Investigation into Population Dynamics

A table summarizes various factors affecting the status of endangered species, including breeding su

Medium

Evaluating Policy Measures for Mitigating Climate Change

A table is provided summarizing several climate policy measures, their predicted effectiveness, and

Hard

Evaluating the Effectiveness of International Environmental Agreements

International agreements such as the Montreal Protocol, Kyoto Protocol, and Paris Agreement aim to m

Hard

Experiment on Halocarbon Persistence in the Stratosphere

A laboratory experiment simulates stratospheric conditions to evaluate the persistence of various ha

Extreme

Global Sea Level Rise and Its Consequences

Sea level rise is one of the measurable impacts of global climate change. This question uses simple

Easy

Halocarbon Effects on Stratospheric Ozone: Incomplete Ozone Degradation Account

A researcher simulates the impact of halocarbons on stratospheric ozone by exposing an ozone-rich ga

Hard

International Environmental Agreements: Montreal vs. Paris

Compare international treaties aimed at protecting the environment and assess their effectiveness.

Easy

Quantitative Analysis of UV-Induced Ozone Formation

This question requires you to quantify the rate of ozone formation in the stratosphere based on UV p

Hard

Radiative Forcing by Black Carbon (Soot)

This question examines the concept of radiative forcing and requires you to calculate its value base

Medium

Sources of Greenhouse Gas Emissions Analysis

This question examines the contributions of various sectors to greenhouse gas emissions and asks you

Medium

The Role of International Agreements in Mitigating Climate Change

This question examines the role of international agreements in reducing greenhouse gas emissions and

Easy

Thermal Expansion of the Oceans

Thermal expansion is a significant contributor to sea level rise as the oceans warm. Consider the eq

Hard

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Tips from Former AP Students

FAQWe thought you might have some questions...
Where can I find practice free response questions for the AP Environmental Science exam?
The free response section of each AP exam varies slightly, so you’ll definitely want to practice that before stepping into that exam room. Here are some free places to find practice FRQs :
  • Of course, make sure to run through College Board's past FRQ questions!
  • Once you’re done with those go through all the questions in the AP Environmental ScienceFree Response Room. You can answer the question and have it grade you against the rubric so you know exactly where to improve.
  • Reddit it also a great place to find AP free response questions that other students may have access to.
How do I practice for AP AP Environmental Science Exam FRQs?
Once you’re done reviewing your study guides, find and bookmark all the free response questions you can find. The question above has some good places to look! while you’re going through them, simulate exam conditions by setting a timer that matches the time allowed on the actual exam. Time management is going to help you answer the FRQs on the real exam concisely when you’re in that time crunch.
What are some tips for AP Environmental Science free response questions?
Before you start writing out your response, take a few minutes to outline the key points you want to make sure to touch on. This may seem like a waste of time, but it’s very helpful in making sure your response effectively addresses all the parts of the question. Once you do your practice free response questions, compare them to scoring guidelines and sample responses to identify areas for improvement. When you do the free response practice on the AP Environmental Science Free Response Room, there’s an option to let it grade your response against the rubric and tell you exactly what you need to study more.
How do I answer AP Environmental Science free-response questions?
Answering AP Environmental Science free response questions the right way is all about practice! As you go through the AP AP Environmental Science Free Response Room, treat it like a real exam and approach it this way so you stay calm during the actual exam. When you first see the question, take some time to process exactly what it’s asking. Make sure to also read through all the sub-parts in the question and re-read the main prompt, making sure to circle and underline any key information. This will help you allocate your time properly and also make sure you are hitting all the parts of the question. Before you answer each question, note down the key points you want to hit and evidence you want to use (where applicable). Once you have the skeleton of your response, writing it out will be quick, plus you won’t make any silly mistake in a rush and forget something important.