NumicornNumicornLearn, solve, progress

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.

Select a test

5 Tests
1. Test2. Test3. Test4. Test5. Test

3. Test

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

What is competition in an ecosystem?

Please select an answer first.

Correct answer: A

The correct answer is A struggle between organisms for limited resources.

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Organisms compete when they need the same limited resource, such as food, water, space, or sunlight.
  3. Check the choice: The correct choice is A struggle between organisms for limited resources.

Organisms compete when they need the same limited resource, such as food, water, space, or sunlight.

2. QuestionMultiple choice

What is an example of two organisms helping each other?

Please select an answer first.

Correct answer: B

The correct answer is A bee gets nectar while a flower receives help with pollination..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: The bee gets food and the flower can benefit when pollen is moved between flowers.
  3. Check the choice: The correct choice is A bee gets nectar while a flower receives help with pollination..

The bee gets food and the flower can benefit when pollen is moved between flowers.

3. QuestionMultiple choice

What is a predator-prey relationship?

Please select an answer first.

Correct answer: C

The correct answer is One organism hunts and eats another organism..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: A predator gets energy by hunting and eating prey.
  3. Check the choice: The correct choice is One organism hunts and eats another organism..

A predator gets energy by hunting and eating prey.

4. QuestionMultiple choice

How can camouflage help an organism?

Please select an answer first.

Correct answer: D

The correct answer is It can make the organism harder to see in its habitat..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Camouflage can help an organism avoid predators or approach prey.
  3. Check the choice: The correct choice is It can make the organism harder to see in its habitat..

Camouflage can help an organism avoid predators or approach prey.

5. QuestionMultiple choice

Why might two plants compete in a dry habitat?

Please select an answer first.

Correct answer: A

The correct answer is They may need the same limited water..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Limited water can cause plants to compete for access to moisture in the soil.
  3. Check the choice: The correct choice is They may need the same limited water..

Limited water can cause plants to compete for access to moisture in the soil.

6. QuestionMultiple choice

How can a change in food supply affect a habitat?

Please select an answer first.

Correct answer: B

The correct answer is Organisms that depend on that food may need to compete, move, or decrease in number..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Food availability can change population size, movement, and interactions.
  3. Check the choice: The correct choice is Organisms that depend on that food may need to compete, move, or decrease in number..

Food availability can change population size, movement, and interactions.

7. QuestionMultiple choice

What may happen when a nonnative species enters an ecosystem and has few predators?

Please select an answer first.

Correct answer: C

The correct answer is It may spread quickly and compete with native organisms for resources..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: A species with few natural controls may use resources that native organisms also need.
  3. Check the choice: The correct choice is It may spread quickly and compete with native organisms for resources..

A species with few natural controls may use resources that native organisms also need.

8. QuestionMultiple choice

How can a tall tree affect a small plant growing below it?

Please select an answer first.

Correct answer: D

The correct answer is The tree may block sunlight, causing the small plant to compete for light..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Plants can compete for sunlight when taller plants shade plants below them.
  3. Check the choice: The correct choice is The tree may block sunlight, causing the small plant to compete for light..

Plants can compete for sunlight when taller plants shade plants below them.

9. QuestionMultiple choice

Why might some animals move to a new area during a season?

Please select an answer first.

Correct answer: A

The correct answer is They may follow food, water, shelter, or suitable temperatures..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Movement can help animals find resources and conditions needed for survival.
  3. Check the choice: The correct choice is They may follow food, water, shelter, or suitable temperatures..

Movement can help animals find resources and conditions needed for survival.

10. QuestionMultiple choice

How does an adaptation help an organism?

Please select an answer first.

Correct answer: B

The correct answer is It helps the organism meet a need or survive in its environment..

  1. Identify the ecosystem clue: Look for the organism, resource, relationship, or environmental change described.
  2. Connect the clue to the ecosystem: Adaptations are useful features or behaviors that help organisms live in particular environments.
  3. Check the choice: The correct choice is It helps the organism meet a need or survive in its environment..

Adaptations are useful features or behaviors that help organisms live in particular environments.

Previous testNext test

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.