Free Response Questions (College Board AP® Environmental Science): Exam Questions

20 mins2 questions
1a
1 mark

A research team is investigating the effect of solar and wind energy adoption on local air quality in a city previously reliant on coal power. The study measures airborne particulate matter (PM 2.5) and carbon dioxide (CO₂) levels before and after transitioning to renewables.

Identify the dependent variable in the study.

1b
1 mark

 Identify a testable hypothesis for the study.

1c
1 mark

Describe one reason why researchers should include a city that has not switched to renewables as a control.

1d
1 mark

Explain how seasonality might affect air quality measurements in the study.

1e
1 mark

Identify one source of PM2.5 pollution that would still be present even after transitioning to renewable energy.

1f
1 mark

Describe one possible economic impact of transitioning from coal to renewable energy in the city.

1g
1 mark

Explain how increased solar panel production could create a different environmental problem.

1h
1 mark

Identify one way a government policy could accelerate the transition to renewable energy [1 point].

1i
1 mark

Explain how a life cycle assessment (LCA) could help policymakers understand the full environmental impact of wind and solar energy.

1j
1 mark

Describe one reason why some communities may resist the transition to solar and wind power.

2a
1 mark

Biofuels, derived from plant material, are being promoted as an alternative to fossil fuels. While biofuels reduce CO₂ emissions compared to gasoline, they also have environmental drawbacks.

Identify one biomass-based fuel that can be used as an alternative to gasoline.

2b
1 mark

Explain why biofuels are considered carbon neutral in theory but may not be in practice.

2c
1 mark

Describe one disadvantage of large-scale corn-based ethanol production.

2d
1 mark

Explain how biofuel production could contribute to deforestation.

2e
1 mark

Explain one advantage of algae-based biofuels over corn-based biofuels.

2f
1 mark

Describe how government policies, such as subsidies, could influence biofuel adoption.

2g
1 mark

Identify one major limitation of replacing all fossil fuels with biofuels.

2h
1 mark

Describe one impact of increased biofuel demand on global food prices.

2i
1 mark

Explain how biofuel use could still contribute to climate change despite lower CO₂ emissions.

2j
1 mark

Propose a sustainable method to produce biofuels while minimizing environmental damage.