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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

How can pollution affect an aquatic ecosystem?

Please select an answer first.

Correct answer: A

The correct answer is It can make water unsafe and harm organisms that depend on it..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Pollution can change water quality and affect the health and populations of aquatic organisms.
  3. Check the choice: The correct choice is It can make water unsafe and harm organisms that depend on it..

Pollution can change water quality and affect the health and populations of aquatic organisms.

2. QuestionMultiple choice

What could happen if a major predator is removed from an ecosystem?

Please select an answer first.

Correct answer: B

The correct answer is The prey population may increase and use more of its food resources..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Removing a predator can change population balance and increase pressure on prey food sources.
  3. Check the choice: The correct choice is The prey population may increase and use more of its food resources..

Removing a predator can change population balance and increase pressure on prey food sources.

3. QuestionMultiple choice

How can a long drought affect a grassland ecosystem?

Please select an answer first.

Correct answer: C

The correct answer is Less water can reduce plant growth and affect animals that depend on the plants..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Drought changes water availability, which can affect plants, herbivores, and predators.
  3. Check the choice: The correct choice is Less water can reduce plant growth and affect animals that depend on the plants..

Drought changes water availability, which can affect plants, herbivores, and predators.

4. QuestionMultiple choice

Why can planting native plants help a local ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is Native plants can provide suitable food and shelter for local organisms..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Native plants are adapted to local conditions and can support local food webs.
  3. Check the choice: The correct choice is Native plants can provide suitable food and shelter for local organisms..

Native plants are adapted to local conditions and can support local food webs.

5. QuestionMultiple choice

What usually limits how large a population can become?

Please select an answer first.

Correct answer: A

The correct answer is The amount of available food, water, space, and shelter.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Resources and environmental conditions limit population growth.
  3. Check the choice: The correct choice is The amount of available food, water, space, and shelter.

Resources and environmental conditions limit population growth.

6. QuestionMultiple choice

How could a beaver dam change a stream ecosystem?

Please select an answer first.

Correct answer: B

The correct answer is It can create a pond that changes water flow and provides habitat for different organisms..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: A dam can change water conditions and create new habitats, affecting many populations.
  3. Check the choice: The correct choice is It can create a pond that changes water flow and provides habitat for different organisms..

A dam can change water conditions and create new habitats, affecting many populations.

7. QuestionMultiple choice

What may happen after a natural fire in a grassland?

Please select an answer first.

Correct answer: C

The correct answer is Some organisms may be harmed, but new growth can later provide habitat and food..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Some ecosystems can recover after a natural disturbance as organisms recolonize and plants regrow.
  3. Check the choice: The correct choice is Some organisms may be harmed, but new growth can later provide habitat and food..

Some ecosystems can recover after a natural disturbance as organisms recolonize and plants regrow.

8. QuestionMultiple choice

Which action can help protect an ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is Reducing waste and protecting clean water and habitats.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Conservation actions reduce harm and help ecosystems continue supporting organisms.
  3. Check the choice: The correct choice is Reducing waste and protecting clean water and habitats.

Conservation actions reduce harm and help ecosystems continue supporting organisms.

9. QuestionMultiple choice

Which observation is evidence that an ecosystem has changed?

Please select an answer first.

Correct answer: A

The correct answer is A pond has fewer frogs and more algae after fertilizer enters the water..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: A change in organism populations after a new input is evidence of an ecosystem change.
  3. Check the choice: The correct choice is A pond has fewer frogs and more algae after fertilizer enters the water..

A change in organism populations after a new input is evidence of an ecosystem change.

10. QuestionMultiple choice

How can planting vegetation near a stream help the ecosystem?

Please select an answer first.

Correct answer: B

The correct answer is Plant roots can hold soil in place and reduce the amount of runoff entering the water..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Plants can reduce erosion and help filter runoff before it reaches a stream.
  3. Check the choice: The correct choice is Plant roots can hold soil in place and reduce the amount of runoff entering the water..

Plants can reduce erosion and help filter runoff before it reaches a stream.

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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.