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Arizona ACT Aspire · Grade 9 · Science

Arizona ACT Aspire Science Practice Test: Grade 9

Build Grade 9 Arizona ACT Aspire Science readiness with five focused 10-question practice sets covering physical science, life science, Earth and space science, data, investigation, and engineering.

Arizona ACT Aspire Science Grade 9 practice sets

This Arizona ACT Aspire Science Practice Test: Grade 9 page provides five short practice sets with 10 original multiple-choice questions each. The sets support supplemental review across physical science, life science, Earth and space science, scientific investigation, data, and engineering evidence.

Skills covered

  • Chemical reactions, thermal energy, elements, circuits, forces, potential energy, density, conservation of mass, and waves
  • Cell structures, inherited traits, natural selection, decomposers, food chains, carrying capacity, biodiversity, and photosynthesis
  • Earth rotation, weather and climate, water cycle, plate tectonics, greenhouse gases, renewable energy, Moon phases, erosion, ice cores, and rocks
  • Variables, controls, graphs, repeated trials, association and causation, conclusions, outliers, source reliability, models, and testable claims
  • Engineering criteria and constraints, filters, stormwater, earthquake design, reaction data, solar panels, drought, invasive species, and scientific explanations

How to use this page

Complete one 10-question set at a time. Record evidence and units when needed, review each explanation, and distinguish a measured result from an assumption.

This is supplemental State Test Practice, State Assessment Practice, and Standardized Test Practice. It does not replace current Arizona Department of Education or ACT Aspire guidance, official blueprints, accommodations, or testing schedules.

For the broader Arizona assessment hub, visit Arizona State Assessments.

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Arizona ACT Aspire Science Grade 9 Practice Questions

A 10-question Arizona ACT Aspire Science Grade 9 practice set on life science and ecology, with answers and explanations.

Read each science scenario carefully, choose one answer, and review the explanation after responding.

10 Questions
0/10 Questions0 %
Correct 0
Incorrect 0
Unanswered 10
1. QuestionMultiple choice

What is the main function of the cell membrane?

Please select an answer first.

Correct answer: A

The correct answer is It controls what enters and leaves the cell.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: The membrane regulates the movement of substances into and out of the cell.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

The membrane regulates the movement of substances into and out of the cell.

2. QuestionMultiple choice

Why do cells need mitochondria?

Please select an answer first.

Correct answer: B

The correct answer is To help release usable energy from food.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Mitochondria help transfer energy from food into a form cells can use.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Mitochondria help transfer energy from food into a form cells can use.

3. QuestionMultiple choice

Which example is an inherited trait?

Please select an answer first.

Correct answer: C

The correct answer is A genetically determined blood type.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Inherited traits are passed through genetic information.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Inherited traits are passed through genetic information.

4. QuestionMultiple choice

What may happen if a predator is removed from an ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is The prey population may increase.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Fewer predators can allow prey numbers to rise if other limits do not change.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Fewer predators can allow prey numbers to rise if other limits do not change.

5. QuestionMultiple choice

How can natural selection change a population?

Please select an answer first.

Correct answer: A

The correct answer is Helpful inherited traits may become more common.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Individuals with advantageous inherited traits are more likely to reproduce.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Individuals with advantageous inherited traits are more likely to reproduce.

6. QuestionMultiple choice

What is the role of decomposers?

Please select an answer first.

Correct answer: B

The correct answer is They return nutrients to the environment by breaking down dead matter.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Decomposers recycle nutrients from dead organisms and waste.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Decomposers recycle nutrients from dead organisms and waste.

7. QuestionMultiple choice

Why is less energy available at higher levels of a food chain?

Please select an answer first.

Correct answer: C

The correct answer is Organisms use much energy for life processes and release some as heat.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Energy transfer between trophic levels is not fully efficient.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Energy transfer between trophic levels is not fully efficient.

8. QuestionMultiple choice

What happens when a population exceeds carrying capacity?

Please select an answer first.

Correct answer: D

The correct answer is Competition for limited resources can increase.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Limited food, water, space, or shelter can reduce population growth.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Limited food, water, space, or shelter can reduce population growth.

9. QuestionMultiple choice

Why can biodiversity improve ecosystem stability?

Please select an answer first.

Correct answer: A

The correct answer is Different species can respond differently to environmental changes.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Different roles and responses can help ecosystem functions continue.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Different roles and responses can help ecosystem functions continue.

10. QuestionMultiple choice

Which process allows plants to store light energy in glucose?

Please select an answer first.

Correct answer: B

The correct answer is Photosynthesis.

  1. Identify the evidence: Read the scenario, model, or data and identify the scientific evidence provided.
  2. Apply the science idea: Photosynthesis uses light energy to build glucose from carbon dioxide and water.
  3. Check the conclusion: Make sure the conclusion is supported by the evidence and matches the question.

Photosynthesis uses light energy to build glucose from carbon dioxide and water.

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Frequently asked questions about Arizona ACT Aspire Science Practice Test: Grade 9

Which Science skills are covered?

The page covers physical science, life science, Earth and space science, energy, ecosystems, data analysis, investigation, source evaluation, and engineering.

How many questions are included?

There are five practice sets with 10 questions each, for 50 questions in total. Each set can be completed separately.

Are these official ACT Aspire questions?

No. These are original supplemental practice questions. Check the latest Arizona Department of Education and ACT information for official materials, standards, accommodations, and policies.