中文（繁體）
中文（简体）
English
AP Environmental Science Past Papers & Drilling: Energy Flow, Carbon Cycle, Population
TUTORZONE ORIGINAL DRILLING MOCK · AP ENVIRONMENTAL SCIENCE
Written to the College Board exam format: Section I multiple choice, 80 questions, 1 h 30 min, 60% (individual + 3-5 quantitative sets); Section II free response, 3 questions, 1 h 10 min, 40% (design, analysis, solution). This drilling mock demonstrates 6 questions with answers and techniques.
What is in the AP Environmental Science exam?
Direct answer: multiple choice 80 questions, 1 h 30 min, 60%; free response 3 questions, 1 h 10 min, 40%.
Assessment at a glance (2027)
| Component | Content | Weighting | Duration |
|---|---|---|---|
| Section II (Free Response) | 3: design / analysis / solution | 40% | 1 h 10 min |
| Section I (Multiple Choice) | 80: individual + data sets | 60% | 1 h 30 min |
AP Environmental Science drilling technique: 10% rule for energy flow; photosynthesis takes in CO2, respiration releases it; keep bioaccumulation (one organism) and biomagnification (food chain) apart. In design answers state hypothesis, control and variables.
How this paper was built
This is a TutorZone original drilling mock: the questions follow the College Board AP Environmental Science format and the answers are our own, not College Board past papers or marking references.
Pacing
| Section | Marks | Suggested time | What to do first |
|---|---|---|---|
| Section II (Free Response) | 40% | about 23 min per question | experimental design + data reasoning |
| Section I (Multiple Choice) | 60% | about 68 s per question | quantitative data reading |
What is the 10% rule?
Direct answer: about 10% of energy passes to the next trophic level; the rest is lost as heat and respiration.
Drilling (6 demonstrated)
Demonstrates investigation design, energy flow, carbon cycle, waste, bioaccumulation and population.
Question 1 (10 marks)
Design an investigation into the effect of a pesticide on stream invertebrates.
Question 2 (10 marks)
Explain the 10% rule of energy transfer in a food chain.
Question 3 (10 marks)
Explain the roles of photosynthesis and respiration in the carbon cycle.
Question 4 (10 marks)
Give three ways to reduce municipal solid waste.
Question 5 (10 marks)
Explain the difference between bioaccumulation and biomagnification.
Question 6 (10 marks)
Explain the four stages of the demographic transition.
Bioaccumulation vs biomagnification?
Direct answer: bioaccumulation builds up inside one organism; biomagnification rises up the food chain.
Answers and marks per question
Question 1
(1) Hypothesis (3). (2) Control and treatment groups (3). (3) Measured variables (species count, density) (4).
Question 2
Only about 10% of energy passes to the next trophic level; the rest is lost as heat, respiration and waste (10).
Question 3
Photosynthesis takes in atmospheric CO2 to build organic matter (5); respiration breaks down organic matter and releases CO2 (5).
Question 4
(1) Source reduction (less packaging) (3.5). (2) Recycling and composting (3.5). (3) Waste-to-energy incineration (3).
Question 5
Bioaccumulation is a pollutant building up inside one organism over time (5); biomagnification is rising concentration up the food chain (5).
Question 6
(1) High birth, high death (2.5). (2) High birth, low death (2.5). (3) Low birth, low death (2.5). (4) Low birth, low death, ageing (2.5).
Which topics does this paper drill?
Direct answer: investigation design, energy flow, carbon cycle, solid waste, bioaccumulation and magnification, population transition.
Where these marks are usually lost
| Mistake | What it looks like | What it costs | Instead |
|---|---|---|---|
| Energy flow 100% | All energy passes | Only about 10% per level | 10% rule |
| Bioaccumulation vs magnification | Treated as one | accumulation=organism, magnification=food chain | organism vs food chain |
| Design missing control | Treatment only | Include control and variables | control + variables |
How to use this paper
First drill: all 6 questions with no references.
Mark it: check the 10% rule and the three design layers.
Second drill: redo three to seven days later, aiming for a faster finish.
What should I do after drilling this paper?
Direct answer: log design answers missing a control or energy-flow errors; redo in three to seven days; and drill the multiple-choice data sets.
FAQ
Is this a College Board past paper?
No. The questions and answers are TutorZone originals, not College Board past papers or marking references.
What does AP Environmental Science test?
Multiple choice 80 questions, 1 h 30 min, 60%; free response 3 questions, 1 h 10 min, 40%.
What is the 10% rule?
About 10% of energy passes to the next trophic level in a food chain.
Official references
| Resource | What to check |
|---|---|
| College Board AP Environmental Science exam page | Confirm the format and question counts |
| https://www.tutorzone.com.hk/en-ap-biology-mock-2027/ | AP Biology drilling mock |
Related: practice area · AP Biology drilling mock
Next step: find a tutor / register as a tutor
After drilling, the hard part is telling a conceptual error from a writing error. Tell us the year group, the school and your available times, and TutorZone will match you with a tutor who knows the HKEAA assessment requirements.
Demand for tutors in this subject is steady, and those who can explain the marking scheme and where marks are won are especially sought after. Register free; you pay only when a match succeeds.
