U5 FRQ Practice
Master AP Environmental Science Unit 5 free-response questions on land use, agriculture, forestry, mining, urbanization, and sustainability with strategy and practice.
What you'll do in this lesson
A voice-first session with the Crimsora tutor on U5 FRQ Practice, then targeted practice and FRQs — with the tutor adapting to where you get stuck.
What this lesson covers
Unit 5 covers how humans use land and resources, and the AP exam loves to test these ideas through free-response questions that ask you to describe, explain, calculate, and propose solutions. Knowing the content is only half the battle — the other half is delivering answers in the exact form the rubric rewards. This lesson does not re-teach agriculture, forestry, mining, urbanization, or the tragedy of the commons; instead it shows you how to convert what you already know into full-credit FRQ responses. You will learn to decode task verbs, structure each point, handle two-part calculations, and avoid the vague phrasing that leaves easy points on the table.
How Unit 5 Concepts Appear on FRQs
AP Environmental Science has three FRQ types: design an investigation, analyze an environmental problem and propose a solution, and analyze data. Unit 5 land-use content shows up in all three because human resource use generates measurable data, testable questions, and real problems needing solutions.
A typical Unit 5 FRQ gives a scenario — a town clearing forest for farmland, a fishery collapsing, a city facing stormwater runoff, or a mine reclamation project. The question then breaks into parts labeled (a) through (e), each usually worth one point and each tied to a specific task verb.
The exam rewards precision. A prompt asking you to describe a consequence of urban sprawl will not accept the single word pollution; it wants a specific, complete statement such as impervious surfaces increase runoff that carries oil and sediment into streams. Reading the verb tells you exactly how much to write.
A typical Unit 5 FRQ gives a scenario — a town clearing forest for farmland, a fishery collapsing, a city facing stormwater runoff, or a mine reclamation project. The question then breaks into parts labeled (a) through (e), each usually worth one point and each tied to a specific task verb.
| Prompt style | Unit 5 example | What it wants |
|---|---|---|
| Identify | Name a farming method | A term, no explanation |
| Describe | Describe how tilling causes erosion | A characteristic or process |
| Explain | Explain why overfishing lowers yield | A cause-and-effect chain |
| Calculate | Find percent change in yield | Setup plus answer with units |
| Propose/Justify | Suggest a sustainable practice and justify | Solution plus reasoning |
Decoding Task Verbs and Earning Each Point
Every FRQ point has a clear boundary. Graders look for one correct, on-topic idea per point and stop reading once you contradict yourself, so answer directly and avoid hedging.
Identify or state means give a fact or term — one phrase is enough. Describe means provide relevant characteristics; you must say what something is or how it looks or works. Explain demands a reason or mechanism, usually a because or so that chain connecting a cause to an effect. Justify requires linking your choice to evidence or an environmental principle.
A reliable technique is the claim-plus-because sentence. For an explain point, write your claim, then the word because, then the mechanism. Example: monoculture reduces biodiversity because a single crop provides only one type of habitat and food, so specialist species decline.
Common point-losing mistakes include restating the question, listing multiple guesses hoping one is right (graders may take the first answer), forgetting units on calculations, and giving a benefit when asked for a drawback. Answer parts in order and label them (a), (b), (c) so the grader finds each response quickly. If a part has two tasks — describe AND explain — you must do both to earn the point.
Identify or state means give a fact or term — one phrase is enough. Describe means provide relevant characteristics; you must say what something is or how it looks or works. Explain demands a reason or mechanism, usually a because or so that chain connecting a cause to an effect. Justify requires linking your choice to evidence or an environmental principle.
A reliable technique is the claim-plus-because sentence. For an explain point, write your claim, then the word because, then the mechanism. Example: monoculture reduces biodiversity because a single crop provides only one type of habitat and food, so specialist species decline.
Common point-losing mistakes include restating the question, listing multiple guesses hoping one is right (graders may take the first answer), forgetting units on calculations, and giving a benefit when asked for a drawback. Answer parts in order and label them (a), (b), (c) so the grader finds each response quickly. If a part has two tasks — describe AND explain — you must do both to earn the point.
Attacking Calculation and Data FRQs
Unit 5 calculations often involve percent change in crop yield, land area conversions, resource depletion rates, or reading a graph of fish population versus fishing effort. The data-analysis FRQ always includes at least one setup-and-solve calculation, and you earn points for showing the correct setup even if the final arithmetic slips.
Always write the formula, substitute the numbers, then box the answer with correct units. Percent change is . Rates need a time unit, areas need square units, and dimensional analysis keeps you honest when converting hectares, acres, or tons.
When a prompt says describe the trend shown in the graph, reference actual values: as fishing effort rose from 10 to 40 boats, catch increased then declined past the maximum sustainable yield. Cite data. When asked to explain a trend, give the underlying environmental cause. Never leave a calculation blank — a correct setup with a wrong number often still scores.
Always write the formula, substitute the numbers, then box the answer with correct units. Percent change is . Rates need a time unit, areas need square units, and dimensional analysis keeps you honest when converting hectares, acres, or tons.
| Step | Action | Why it matters |
|---|---|---|
| 1 | Write the formula | Shows method, earns setup credit |
| 2 | Substitute values | Connects data to formula |
| 3 | Solve carefully | Arithmetic error costs one point at most |
| 4 | Label units | Missing units can lose the point |
Proposing Solutions and Writing Complete Responses
The second FRQ type asks you to propose a solution to a land-use problem and justify it, which is where Unit 5 sustainability thinking pays off. A strong solution is specific and actionable, and the justification explains how it addresses the exact problem in the scenario.
Weak answer: use better farming. Strong answer: plant a cover crop such as clover in the off-season to hold soil in place, which reduces erosion and adds nitrogen so the farmer needs less synthetic fertilizer. Notice the solution names a method and the justification traces the environmental benefit.
Match your solution to the problem type. Soil erosion pairs with contour plowing, terracing, no-till, or windbreaks. Overfishing pairs with catch limits, no-take zones, or aquaculture. Urban runoff pairs with permeable pavement, rain gardens, or green roofs. Mining damage pairs with reclamation and revegetation.
Budget your time: with roughly 22 minutes per FRQ, spend a minute planning. Underline the verbs, jot the formula you will need, and answer every part even if unsure — partial responses score, blanks never do. Keep sentences short and factual. You do not need an introduction or conclusion; go straight to lettered answers. Full sentences, correct terminology, and one clear idea per point are what turn Unit 5 knowledge into a top score.
Weak answer: use better farming. Strong answer: plant a cover crop such as clover in the off-season to hold soil in place, which reduces erosion and adds nitrogen so the farmer needs less synthetic fertilizer. Notice the solution names a method and the justification traces the environmental benefit.
Match your solution to the problem type. Soil erosion pairs with contour plowing, terracing, no-till, or windbreaks. Overfishing pairs with catch limits, no-take zones, or aquaculture. Urban runoff pairs with permeable pavement, rain gardens, or green roofs. Mining damage pairs with reclamation and revegetation.
Budget your time: with roughly 22 minutes per FRQ, spend a minute planning. Underline the verbs, jot the formula you will need, and answer every part even if unsure — partial responses score, blanks never do. Keep sentences short and factual. You do not need an introduction or conclusion; go straight to lettered answers. Full sentences, correct terminology, and one clear idea per point are what turn Unit 5 knowledge into a top score.
Key terms
- Task verb.
- The command word in an FRQ prompt (identify, describe, explain, calculate, justify) that signals exactly how much and what kind of response earns the point.
- Maximum sustainable yield.
- The largest harvest of a resource, such as fish or timber, that can be taken repeatedly without reducing the resource base over time.
- Percent change.
- A calculation given by , frequently required in Unit 5 data FRQs on yield or population.
- Justify.
- An FRQ task requiring you to support a claim or choice with reasoning tied to evidence or an environmental principle.
- Reclamation.
- The process of restoring mined or degraded land toward a natural or usable state, often through regrading and revegetation.
- Impervious surface.
- A hard surface like pavement or rooftop that water cannot pass through, increasing stormwater runoff in urban areas.
- Setup credit.
- Points awarded on a calculation FRQ for writing the correct formula and substituting values, even if the final arithmetic is wrong.
Worked example
A rural county converts 500 hectares of forest to cropland. In the first year a farm produces 2,000 kilograms of corn per hectare. After three years of intensive tilling, yield drops to 1,400 kilograms per hectare. (a) Calculate the percent change in yield per hectare. (b) Describe one process by which intensive tilling reduced the yield. (c) Propose one soil conservation practice and justify how it would help.
Part (a): Use the percent change formula . Substitute: . The yield decreased by 30 percent. Write the negative sign or the word decrease so the direction is clear, and keep the percent unit.
Part (b): This is a describe point needing a process. Intensive tilling breaks up soil structure and leaves it bare, so wind and water carry away the nutrient-rich topsoil through erosion. With less topsoil and organic matter, the soil holds fewer nutrients and less water, so corn plants grow less vigorously and yield falls. Naming erosion plus its effect on nutrients secures the point.
Part (c): Propose a specific practice and justify it. No-till farming leaves crop residue on the surface and avoids plowing, which keeps roots and organic matter in place to anchor soil. Because the soil stays covered and structured, erosion slows, nutrients and moisture are retained, and yields recover over time. The solution is named and the justification traces the mechanism back to the erosion problem, earning full credit.
Part (b): This is a describe point needing a process. Intensive tilling breaks up soil structure and leaves it bare, so wind and water carry away the nutrient-rich topsoil through erosion. With less topsoil and organic matter, the soil holds fewer nutrients and less water, so corn plants grow less vigorously and yield falls. Naming erosion plus its effect on nutrients secures the point.
Part (c): Propose a specific practice and justify it. No-till farming leaves crop residue on the surface and avoids plowing, which keeps roots and organic matter in place to anchor soil. Because the soil stays covered and structured, erosion slows, nutrients and moisture are retained, and yields recover over time. The solution is named and the justification traces the mechanism back to the erosion problem, earning full credit.
Practice questions
An FRQ prompt states: Explain how urban sprawl onto former farmland increases stormwater runoff. Which response would earn the point?
- Urban sprawl is bad for the environment because it uses too much land
- Sprawl replaces soil and vegetation with impervious surfaces like roads and roofs, so rain cannot infiltrate and instead flows rapidly into storm drains and streams
- There is more pollution and more traffic in cities that sprawl
- Farmland is better than cities for the environment
Answer: Sprawl replaces soil and vegetation with impervious surfaces like roads and roofs, so rain cannot infiltrate and instead flows rapidly into storm drains and streams
The verb explain requires a cause-and-effect mechanism. The correct choice links sprawl to impervious surfaces and then to reduced infiltration and increased runoff — a complete chain. The other options are vague value statements or off-topic and give no mechanism, so a grader could not award the point.
A fishery's catch rises as boats increase from 5 to 20, peaks near 20 boats, then declines as boats increase to 40. Describe the trend and explain the decline in terms of a Unit 5 concept.
Answer: The trend: catch increases with fishing effort up to about 20 boats, reaches a maximum, then decreases as effort rises toward 40 boats. Explanation: beyond the maximum sustainable yield, fish are removed faster than the population can reproduce, so the breeding stock shrinks and future catches fall — this is overexploitation of a common-pool resource.
A full-credit answer first describes the trend using actual values from the prompt (5 to 20 to 40 boats and a peak), satisfying the describe task. It then explains the decline with a mechanism: harvest exceeding the maximum sustainable yield reduces the reproductive population. Citing specific numbers and naming the concept distinguishes a strong response from a vague one.
A mining company strips vegetation and soil to extract coal, leaving bare, compacted ground. Propose one reclamation practice and justify how it reduces environmental harm.
Answer: Regrade the disturbed land to its approximate original contour and replant native vegetation. This restores plant roots that hold soil in place and reduces erosion and sediment runoff into nearby streams, while returning habitat for wildlife and slowing acid mine drainage as vegetation stabilizes the surface.
The propose-and-justify task needs a specific action plus reasoning. Naming regrading and revegetation is the actionable proposal; the justification connects roots to reduced erosion and habitat recovery. A response that only says clean up the mine would be too vague to earn the point because it names no method and no benefit.
FAQ
- How much should I write for each FRQ part?
- Match the task verb. An identify part needs only a word or phrase, while describe and explain parts need one or two complete sentences that include the specific characteristic or mechanism. Writing extra correct material is fine, but padding with vague statements wastes time and can introduce contradictions that cost points.
- Do I lose points for a wrong number in a calculation?
- Usually not all of them. Graders award setup credit when you write the correct formula and substitute the right values, so you can still earn a point even with an arithmetic error. Always show your work and include units — a boxed answer with no setup is riskier than a clear setup with a small slip.
- Can I use bullet points or lists on the AP FRQ?
- You can write in phrases or short sentences and label parts (a), (b), (c), but you should express each idea completely. A bare list of terms may not earn describe or explain points because those verbs require characteristics or mechanisms, not just labels. Clear, direct sentences are the safest format.
- What Unit 5 topics are most likely on the FRQ?
- Any land-use topic can appear, but common scenarios involve soil erosion and conservation from agriculture, sustainable versus unsustainable forestry and mining, urban stormwater runoff, and overfishing or the tragedy of the commons. Expect a calculation on yield, area, or percent change, plus at least one propose-a-solution part.
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