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AP Biology Practice Test

Build AP Biology readiness with original cells, genetics, evolution, ecology, data analysis, and experimental reasoning questions.

AP Biology practice sets

This page provides one canonical AP Biology practice hub with five short sets of 10 original questions each. The sets cover chemistry of life, cells, cellular energetics, communication and heredity, gene expression, natural selection, ecology, experimental design, data analysis, and scientific argumentation.

Skills covered

  • Explain biological concepts, processes, and models
  • Analyze visual representations, data tables, graphs, and experimental results
  • Identify questions, methods, controls, variables, and evidence
  • Use quantitative reasoning and statistical evidence in context
  • Develop and justify scientific arguments using relevant biological evidence

AP Biology course and exam scope

College Board organizes AP Biology into eight units: Chemistry of Life, Cells, Cellular Energetics, Cell Communication and Cell Cycle, Heredity, Gene Expression and Regulation, Natural Selection, and Ecology. The course also emphasizes science practices such as concept explanation, visual representations, questions and methods, data analysis, and argumentation.

College Board’s current exam page describes a hybrid digital exam in which students view questions in Bluebook and handwrite free-response answers in paper booklets. Current information also allows approved calculators on both sections, while 2027 calculator guidance limits handheld calculators with storage capabilities. Check the current official policy before test day.

How to use this page

Start with one untimed set to identify a topic gap, then use timed sets to build pacing. For every missed item, name the biological mechanism, inspect the evidence, and write a conclusion that stays within the experimental conditions.

These questions are original supplemental practice. They are not official College Board questions, secure AP Exam content, AP Classroom assignments, a score predictor, or a substitute for current AP policies and course materials.

For current scope and preparation, review the AP Biology course page, the AP Central course overview, the AP Biology exam page, the AP Biology Course and Exam Description, and the AP calculator policy.

For more study options, visit AP Exam Tests or explore College Readiness Tests, High School Course Tests, and Pomodoro.

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AP Biology Practice Questions

A 10-question AP Biology practice set on ap biology: natural selection, evolution, and ecology, with answers and explanations.

Read the biological scenario, model, data, or experimental design carefully. Choose the best answer and review the explanation after each response.

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1. QuestionMultiple choice

What is natural selection?

Please select an answer first.

Correct answer: C

The correct answer is Heritable differences that affect reproductive success change trait frequencies over generations.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Selection acts on heritable variation through differences in survival or reproduction.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Selection acts on heritable variation through differences in survival or reproduction.

2. QuestionMultiple choice

What is an adaptation?

Please select an answer first.

Correct answer: D

The correct answer is A heritable trait that improves fitness in a particular environment.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Adaptations are inherited features shaped by selection in context.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Adaptations are inherited features shaped by selection in context.

3. QuestionMultiple choice

What does genetic drift describe?

Please select an answer first.

Correct answer: A

The correct answer is Random changes in allele frequencies, especially in small populations.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Chance events can change allele frequencies independently of fitness.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Chance events can change allele frequencies independently of fitness.

4. QuestionMultiple choice

What can a population bottleneck cause?

Please select an answer first.

Correct answer: B

The correct answer is Reduced genetic variation after a sharp decrease in population size.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: A bottleneck randomly removes individuals and can reduce variation.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

A bottleneck randomly removes individuals and can reduce variation.

5. QuestionMultiple choice

What is a homologous structure?

Please select an answer first.

Correct answer: C

The correct answer is A structure inherited from a common ancestor, even if its function differs.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Homology supports common ancestry through shared underlying structure.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Homology supports common ancestry through shared underlying structure.

6. QuestionMultiple choice

What is the role of decomposers in an ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is They recycle matter by breaking down organic material.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Decomposers return nutrients to the ecosystem as they process dead material.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Decomposers return nutrients to the ecosystem as they process dead material.

7. QuestionMultiple choice

What happens to available energy as it moves up trophic levels?

Please select an answer first.

Correct answer: A

The correct answer is It generally decreases because energy is lost through metabolism and heat.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Only a fraction of energy is transferred to the next trophic level.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Only a fraction of energy is transferred to the next trophic level.

8. QuestionMultiple choice

What does carrying capacity represent?

Please select an answer first.

Correct answer: B

The correct answer is The largest population size an environment can sustain over time under given conditions.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Resources and limiting factors constrain sustainable population size.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Resources and limiting factors constrain sustainable population size.

9. QuestionMultiple choice

A population grows rapidly and then levels off near a stable size. Which model fits?

Please select an answer first.

Correct answer: C

The correct answer is Logistic growth.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Logistic growth slows as the population approaches carrying capacity.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Logistic growth slows as the population approaches carrying capacity.

10. QuestionMultiple choice

What is biodiversity important for in ecosystems?

Please select an answer first.

Correct answer: D

The correct answer is It can support resilience and provide varied ecological functions.

  1. Identify the biological system: Determine the process, structure, evidence, or experimental variable described in the AP Biology prompt.
  2. Apply the concept: Variation among organisms and ecosystems can increase functional resilience.
  3. Connect evidence: Check that the conclusion matches the model, data, mechanism, or biological level named in the question.

Variation among organisms and ecosystems can increase functional resilience.

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Frequently asked questions about AP Biology Practice Tests

What topics are included on this AP Biology practice page?

The page covers cells, energetics, communication, heredity, gene expression, evolution, ecology, experimental design, data analysis, and scientific argumentation.

Are these official College Board questions?

No. These are original supplemental questions. Use AP Classroom, Bluebook previews, AP Central, and current College Board course materials for official preparation.

Is the AP Biology exam digital?

College Board’s current exam page describes a hybrid digital exam, with questions in Bluebook and handwritten free-response answers in paper booklets.

Can I use a calculator on AP Biology?

Current College Board policy allows approved calculators on both sections, but students should check the latest device restrictions and 2027 updates.

How should I answer a biology data question?

Identify the variables and trend, cite the relevant evidence, connect it to a biological mechanism, and limit the conclusion to the tested conditions.