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Grade 4 Science · Ecosystem Interactions

Grade 4 Ecosystem Interactions Practice Test

Build Grade 4 Science skills with five 10-question practice tests on habitats, food chains, food webs, populations, resources, relationships, and ecosystem changes.

Ecosystem Interactions Practice Tests

These Grade 4 Science practice tests help students explain how organisms and nonliving factors interact. Students study habitats, populations, communities, producers, consumers, decomposers, food chains, food webs, competition, adaptations, resources, and ecosystem change.

Skills covered

  • Identifying living and nonliving parts of an ecosystem
  • Explaining the roles of producers, consumers, and decomposers
  • Reading food chains and food webs
  • Describing competition, predator-prey relationships, and cooperation
  • Explaining how resource changes affect populations
  • Using evidence to describe ecosystem changes and conservation actions

How to use these practice tests

For each question, identify the organism or environmental factor first. Then ask which resource, relationship, or change connects it to the rest of the ecosystem. Use the evidence in the situation to choose the best explanation.

For more Grade 4 Science practice, return to the Grade 4 Science category.

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Grade 4 Ecosystem Interactions Practice Tests

A 10-question Grade 4 Science practice test on ecosystems, habitats, food chains, food webs, populations, resources, relationships, and environmental change.

Read each ecosystem situation and choose the answer that best explains how organisms and environmental factors interact.

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

A student removes light from one plant but gives two plants the same water and soil. What question is being tested?

Please select an answer first.

Correct answer: A

The correct answer is Whether light affects plant growth.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Changing light while keeping water and soil similar tests the effect of light on plant growth.
  3. Check the choice: The correct choice is Whether light affects plant growth.

Changing light while keeping water and soil similar tests the effect of light on plant growth.

2. QuestionMultiple choice

In an investigation about water and bean plants, what should the student change?

Please select an answer first.

Correct answer: B

The correct answer is The amount of water given to each group.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: The factor being tested is the variable that should be changed between groups.
  3. Check the choice: The correct choice is The amount of water given to each group.

The factor being tested is the variable that should be changed between groups.

3. QuestionMultiple choice

Which data best supports the conclusion that frogs need clean water?

Please select an answer first.

Correct answer: C

The correct answer is More frogs lived in the clean pond than in the polluted pond during the same study..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Comparing frog numbers in similar ponds provides evidence about the relationship between water quality and frogs.
  3. Check the choice: The correct choice is More frogs lived in the clean pond than in the polluted pond during the same study..

Comparing frog numbers in similar ponds provides evidence about the relationship between water quality and frogs.

4. QuestionMultiple choice

What should a scientist do before making a conclusion about an ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is Review repeated observations and compare them with the question being investigated..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Conclusions should be based on evidence collected through careful observations or measurements.
  3. Check the choice: The correct choice is Review repeated observations and compare them with the question being investigated..

Conclusions should be based on evidence collected through careful observations or measurements.

5. QuestionMultiple choice

Why are decomposers important in an ecosystem model?

Please select an answer first.

Correct answer: A

The correct answer is They show how nutrients from dead matter can return to the environment..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Decomposers help recycle nutrients that can become available to producers again.
  3. Check the choice: The correct choice is They show how nutrients from dead matter can return to the environment..

Decomposers help recycle nutrients that can become available to producers again.

6. QuestionMultiple choice

What would a useful ecosystem model include?

Please select an answer first.

Correct answer: B

The correct answer is Organisms, nonliving factors, and arrows showing important interactions or energy flow.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: A model can show how living and nonliving parts interact in an ecosystem.
  3. Check the choice: The correct choice is Organisms, nonliving factors, and arrows showing important interactions or energy flow.

A model can show how living and nonliving parts interact in an ecosystem.

7. QuestionMultiple choice

Why might a scientist compare a desert and a pond ecosystem?

Please select an answer first.

Correct answer: C

The correct answer is To identify how different conditions and resources support different organisms..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Comparing habitats helps reveal how resources and conditions affect the organisms that live there.
  3. Check the choice: The correct choice is To identify how different conditions and resources support different organisms..

Comparing habitats helps reveal how resources and conditions affect the organisms that live there.

8. QuestionMultiple choice

How does energy usually move through a food chain?

Please select an answer first.

Correct answer: D

The correct answer is From the Sun to producers and then to consumers.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Producers capture energy, and consumers receive some of that energy by eating organisms.
  3. Check the choice: The correct choice is From the Sun to producers and then to consumers.

Producers capture energy, and consumers receive some of that energy by eating organisms.

9. QuestionMultiple choice

Which action is a sustainable way to use an ecosystem resource?

Please select an answer first.

Correct answer: A

The correct answer is Taking only as many fish as the population can replace.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Sustainable use allows a resource and the ecosystem that supports it to continue over time.
  3. Check the choice: The correct choice is Taking only as many fish as the population can replace.

Sustainable use allows a resource and the ecosystem that supports it to continue over time.

10. QuestionMultiple choice

Which statement best summarizes ecosystem interactions?

Please select an answer first.

Correct answer: B

The correct answer is Living and nonliving parts interact, and a change in one part can affect many other parts..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Ecosystems are connected systems in which changes can move through food webs and habitats.
  3. Check the choice: The correct choice is Living and nonliving parts interact, and a change in one part can affect many other parts..

Ecosystems are connected systems in which changes can move through food webs and habitats.

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Frequently asked questions about Grade 4 Ecosystem Interactions

What is an ecosystem?

An ecosystem is a system that includes living organisms and the nonliving parts of their environment, with all of these parts interacting.

What are producers, consumers, and decomposers?

Producers make their own food, consumers get energy by eating organisms, and decomposers break down dead matter and recycle nutrients.

How many questions are on this page?

The page includes five mini tests with 10 questions each, for 50 Grade 4 Ecosystem Interactions questions in total.