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Colorado CMAS · Science · Grades 5, 8, and 11

Colorado CMAS Science Practice Test: Grades 5, 8, and 11

Build CMAS Science readiness with five focused 10-question practice sets covering life science, physical science, Earth and space, environmental systems, and scientific practices.

CMAS Science practice sets

This Colorado CMAS Science Practice Test page provides five short practice sets with 10 original multiple-choice questions each. The sets offer supplemental practice for Grades 5, 8, and 11 across life science, physical science, Earth and space science, environmental systems, and scientific investigation.

Science skills covered

  • Living organisms, food and nutrients, roots, cells, populations, relationships, heredity, food chains, biodiversity, and reproduction
  • States and properties of matter, friction, energy, conductors, thermal transfer, forces, chemical change, circuits, and light absorption
  • Earth rotation, solar energy, runoff, erosion, shadows, the Moon, volcanoes, precipitation, fossils, and planetary orbits
  • Clean water, waste reduction, fish populations, forests, renewable resources, invasive species, trees, electricity, sediment, and pollinators
  • Investigation planning, tools, variables, observations, graphs, repeated measurements, models, reliability, and evidence-based explanations

How to use this page

Complete one 10-question set at a time. Identify the evidence, choose the best-supported answer, and review every explanation before moving to the next set.

This is supplemental State Test Practice, State Assessment Practice, and Standardized Test Practice. It does not replace current Colorado Department of Education guidance, official CMAS blueprints, accommodations, or testing policies.

For the Colorado assessment hub, visit Colorado State Assessments.

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Colorado CMAS Science Practice Questions

A 10-question Colorado CMAS Science practice set on environmental systems, with answers and explanations.

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

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

Why is clean water important to living things?

Please select an answer first.

Correct answer: A

The correct answer is Organisms need water for life processes..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Living organisms use water for transport and other processes.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Living organisms use water for transport and other processes.

2. QuestionMultiple choice

Which action reduces waste sent to a landfill?

Please select an answer first.

Correct answer: B

The correct answer is Reusing and recycling materials..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Reuse and recycling can reduce landfill waste.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Reuse and recycling can reduce landfill waste.

3. QuestionMultiple choice

What may happen when too many fish are removed from a lake?

Please select an answer first.

Correct answer: C

The correct answer is The fish population may decline and the food web may change..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Overharvesting can reduce fish numbers and affect connected species.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Overharvesting can reduce fish numbers and affect connected species.

4. QuestionMultiple choice

Why do forests help reduce carbon dioxide in the atmosphere?

Please select an answer first.

Correct answer: D

The correct answer is Trees take in carbon dioxide during photosynthesis..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Photosynthesis removes carbon dioxide from air and stores carbon in plants.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Photosynthesis removes carbon dioxide from air and stores carbon in plants.

5. QuestionMultiple choice

Which resource is renewable when managed carefully?

Please select an answer first.

Correct answer: A

The correct answer is Sunlight.

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Sunlight is continually supplied by the Sun.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Sunlight is continually supplied by the Sun.

6. QuestionMultiple choice

What can happen when an invasive plant spreads through a habitat?

Please select an answer first.

Correct answer: B

The correct answer is It may compete with native plants for resources..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Invasive plants can compete for light, water, space, and nutrients.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Invasive plants can compete for light, water, space, and nutrients.

7. QuestionMultiple choice

Why can trees help lower temperatures in a neighborhood?

Please select an answer first.

Correct answer: C

The correct answer is They provide shade and release water vapor..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Shade and transpiration can reduce nearby heating.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Shade and transpiration can reduce nearby heating.

8. QuestionMultiple choice

Which practice can conserve electricity at school?

Please select an answer first.

Correct answer: D

The correct answer is Turn off lights in empty rooms..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Turning off unused lights reduces electricity use.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Turning off unused lights reduces electricity use.

9. QuestionMultiple choice

A stream becomes cloudy after construction nearby. What may have increased?

Please select an answer first.

Correct answer: A

The correct answer is Sediment runoff..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Exposed soil can wash into a stream and increase sediment.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Exposed soil can wash into a stream and increase sediment.

10. QuestionMultiple choice

Why should people protect habitats for pollinators?

Please select an answer first.

Correct answer: B

The correct answer is Pollinators help many plants reproduce..

  1. Identify the science idea: Read the situation and identify the observable process, pattern, or system.
  2. Use the evidence: Pollinators transfer pollen and support plant reproduction.
  3. Check the choice: Choose the answer that best matches the evidence in the task.

Pollinators transfer pollen and support plant reproduction.

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Frequently asked questions about Colorado CMAS Science Practice Test

Which Science skills are covered?

The page covers supplemental life science, physical science, Earth and space science, environmental systems, and scientific practices for Grades 5, 8, and 11.

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 CMAS Science questions?

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