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AP Environmental Science AP Environmental Science Practice Test 2025

AP Environmental ScienceModel questions
100marks
160min
10questions

This is the official AP Environmental Science AP Environmental Science question paper for 2025, as set in the Model questions examination. It carries 100 full marks and a time allowance of 160 minutes, across 10 questions. On Kekkei you can attempt this AP Environmental Science past paper online with a timer, get instant AI feedback and step-by-step solutions, and track the topics where you lose marks — completely free. Whether you are revising for your AP Environmental Science AP Environmental Science exam or solving previous years' question papers, this 2025 paper is a great way to practise under real exam conditions.

LevelAP Environmental Science
SubjectAP Environmental Science
Year2025 BS
Exam sessionModel questions
Full marks100
Time allowed160 minutes
Questions10, all with step-by-step solutions
A

Multiple Choice

Select the best answer.

10 questions·1 mark each
1Multiple choice1 mark

Which process converts atmospheric N2\text{N}_2 into NH3\text{NH}_3?

  • a

    Nitrogen fixation

  • b

    Nitrification

  • c

    Denitrification

  • d

    Ammonification

Correct answer: a

Nitrogen fixation

Nitrogen fixation by bacteria (e.g., Rhizobium).

The correct answer is (a) Nitrogen fixation.

ecosystemsbiogeochemical-cycles
2Multiple choice1 mark

Plot A: 5 species, 20 each. Plot B: 5 species (92+2+2+2+2). Which is correct?

  • a

    Plot B has higher diversity

  • b

    Equal diversity

  • c

    Equal richness, but Plot A has higher diversity

  • d

    Plot A has higher richness

Correct answer: c

Equal richness, but Plot A has higher diversity

Same richness; A has higher evenness and thus higher diversity.

The correct answer is (c).

biodiversityspecies-richness
3Multiple choice1 mark

Eutrophication is most commonly caused by:

  • a

    Acid rain

  • b

    Excess nitrogen and phosphorus from agricultural runoff

  • c

    Thermal pollution

  • d

    Heavy metal contamination

Correct answer: b

Excess nitrogen and phosphorus from agricultural runoff

Excess N and P from agricultural runoff.

The correct answer is (b).

pollutionwater-quality
4Multiple choice1 mark

Which greenhouse gas has highest GWP per molecule (100 yr)?

  • a

    CO2_2

  • b

    CH4_4

  • c

    N2_2O

  • d

    SF6_6

Correct answer: d

SF6_6

SF6_6: GWP ~23,500.

The correct answer is (d) SF6_6.

climate-changegreenhouse-effect
5Multiple choice1 mark

Which converts kinetic energy of air into electricity?

  • a

    Solar photovoltaic

  • b

    Geothermal

  • c

    Wind

  • d

    Hydroelectric

Correct answer: c

Wind

Wind turbines.

The correct answer is (c) Wind.

energy-resourcesrenewable-energy
6Multiple choice1 mark

Ecological footprint exceeds biocapacity. Meaning?

  • a

    Consuming resources faster than they can be renewed

  • b

    Fully sustainable

  • c

    Exports more than imports

  • d

    High biodiversity

Correct answer: a

Consuming resources faster than they can be renewed

Consuming resources faster than renewal (ecological deficit).

The correct answer is (a).

sustainabilityecological-footprint
7Multiple choice1 mark

Logistic growth: K=500K=500. At what NN is growth fastest?

  • a

    100

  • b

    250

  • c

    500

  • d

    50

Correct answer: b

250

N=K/2=250N=K/2=250.

The correct answer is (b) 250.

population-ecologypopulation-growth
8Multiple choice1 mark

Biome with highest net primary productivity?

  • a

    Tropical rainforest

  • b

    Temperate grassland

  • c

    Boreal forest

  • d

    Tundra

Correct answer: a

Tropical rainforest

Tropical rainforest.

The correct answer is (a).

ecosystemsprimary-productivity
9Multiple choice1 mark

Chemicals primarily responsible for stratospheric ozone depletion?

  • a

    Carbon dioxide

  • b

    Nitrogen oxides

  • c

    Sulfur dioxide

  • d

    Chlorofluorocarbons (CFCs)

Correct answer: d

Chlorofluorocarbons (CFCs)

CFCs; Montreal Protocol addressed this.

The correct answer is (d) CFCs.

pollutionozone-depletion
10Multiple choice1 mark

Leading cause of species extinction worldwide?

  • a

    Overexploitation

  • b

    Habitat loss and degradation

  • c

    Pollution

  • d

    Climate change

Correct answer: b

Habitat loss and degradation

Habitat loss and degradation.

The correct answer is (b).

biodiversityconservation

Frequently asked questions

Where can I find the AP Environmental Science AP Environmental Science question paper 2025?
The full AP Environmental Science AP Environmental Science 2025 (Model questions) question paper is available free on Kekkei. You can read every question online and attempt the paper under timed exam conditions.
Does the AP Environmental Science 2025 paper come with solutions?
Yes. Every question on this AP Environmental Science past paper includes a step-by-step solution, plus instant AI feedback when you attempt it on Kekkei.
How many marks is the AP Environmental Science AP Environmental Science 2025 paper?
The AP Environmental Science AP Environmental Science 2025 paper carries 100 full marks and is meant to be completed in 160 minutes, across 10 questions.
Is practising this AP Environmental Science past paper free?
Yes — reading and attempting this AP Environmental Science past paper on Kekkei is completely free.