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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

Which food chain is in a reasonable order?

Please select an answer first.

Correct answer: A

The correct answer is Grass → rabbit → fox.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: The grass is the producer, the rabbit eats the grass, and the fox can eat the rabbit.
  3. Check the choice: The correct choice is Grass → rabbit → fox.

The grass is the producer, the rabbit eats the grass, and the fox can eat the rabbit.

2. QuestionMultiple choice

What do arrows in a food chain usually show?

Please select an answer first.

Correct answer: B

The correct answer is The direction that energy moves from one organism to another.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Arrows show how energy and food move from a source to the organism that eats it.
  3. Check the choice: The correct choice is The direction that energy moves from one organism to another.

Arrows show how energy and food move from a source to the organism that eats it.

3. QuestionMultiple choice

In the chain grain → mouse → snake → hawk, which organism is the primary consumer?

Please select an answer first.

Correct answer: C

The correct answer is The mouse.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: The mouse is the first consumer because it eats the producer, grain.
  3. Check the choice: The correct choice is The mouse.

The mouse is the first consumer because it eats the producer, grain.

4. QuestionMultiple choice

What does a food web show?

Please select an answer first.

Correct answer: D

The correct answer is Several connected food chains in an ecosystem.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: A food web shows that organisms can have more than one food relationship.
  3. Check the choice: The correct choice is Several connected food chains in an ecosystem.

A food web shows that organisms can have more than one food relationship.

5. QuestionMultiple choice

If a grassland has much less grass, what may happen to grass-eating rabbits?

Please select an answer first.

Correct answer: A

The correct answer is Their population may decrease because less food is available..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: A decrease in a food source can reduce the number of consumers that depend on it.
  3. Check the choice: The correct choice is Their population may decrease because less food is available..

A decrease in a food source can reduce the number of consumers that depend on it.

6. QuestionMultiple choice

If the number of mice decreases, which animal might have less food?

Please select an answer first.

Correct answer: B

The correct answer is An owl that eats mice.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Predators may have less available food when a prey population decreases.
  3. Check the choice: The correct choice is An owl that eats mice.

Predators may have less available food when a prey population decreases.

7. QuestionMultiple choice

What is a primary consumer?

Please select an answer first.

Correct answer: C

The correct answer is An organism that eats a producer.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Primary consumers obtain energy by eating producers such as plants or algae.
  3. Check the choice: The correct choice is An organism that eats a producer.

Primary consumers obtain energy by eating producers such as plants or algae.

8. QuestionMultiple choice

Why are decomposers important in a food web?

Please select an answer first.

Correct answer: D

The correct answer is They break down dead organisms and help return nutrients 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 recycle materials that producers can use again.
  3. Check the choice: The correct choice is They break down dead organisms and help return nutrients to the environment..

Decomposers recycle materials that producers can use again.

9. QuestionMultiple choice

Can one organism be part of more than one food chain?

Please select an answer first.

Correct answer: A

The correct answer is Yes, because it may eat or be eaten by different organisms..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Multiple feeding relationships connect food chains into a food web.
  3. Check the choice: The correct choice is Yes, because it may eat or be eaten by different organisms..

Multiple feeding relationships connect food chains into a food web.

10. QuestionMultiple choice

Where does energy for most food chains on Earth begin?

Please select an answer first.

Correct answer: B

The correct answer is The Sun.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Most ecosystems receive their initial energy from sunlight captured by producers.
  3. Check the choice: The correct choice is The Sun.

Most ecosystems receive their initial energy from sunlight captured by producers.

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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.