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Grade 3 Science · Ecosystems

Grade 3 Ecosystems Practice Test

Explore Grade 3 Science with five 10-question practice tests on habitats, biotic and abiotic factors, food chains, producers, consumers, decomposers, and ecosystem relationships.

Ecosystems Practice Tests

These Grade 3 Science practice tests help students understand how living things interact with one another and with nonliving parts of their habitats. Students practice food chains, energy flow, and ecosystem roles.

Skills covered

  • Defining ecosystems and habitats
  • Identifying biotic and abiotic factors
  • Recognizing producers, consumers, and decomposers
  • Reading simple food chains and food webs
  • Explaining how energy moves from the Sun
  • Describing how changes affect ecosystem relationships

How to use these practice tests

Look for clues about whether something is living or nonliving. Then identify how organisms get energy, what resources their habitats provide, and how a change in one population can affect others.

For more Grade 3 Science practice, return to the Grade 3 Science category.

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5 Tests
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4. Test

Grade 3 Ecosystems Practice Tests

A 10-question Grade 3 Science practice test on ecosystems, habitats, biotic and abiotic factors, producers, consumers, decomposers, and food chains.

Read each ecosystem question carefully. Identify the living or nonliving part, the organism role, or the relationship described, then choose the best answer.

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

What happens when two animals need the same limited food?

Please select an answer first.

Correct answer: A

The correct answer is They compete for the food..

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: Competition occurs when organisms need the same limited resource.
  3. Check the choice: The correct choice is They compete for the food..

Competition occurs when organisms need the same limited resource.

2. QuestionMultiple choice

How can bees and flowers help each other?

Please select an answer first.

Correct answer: B

The correct answer is Bees get nectar, and flowers can be pollinated as bees visit..

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: Bees receive food while their visits can help flowers reproduce.
  3. Check the choice: The correct choice is Bees get nectar, and flowers can be pollinated as bees visit..

Bees receive food while their visits can help flowers reproduce.

3. QuestionMultiple choice

What is a predator?

Please select an answer first.

Correct answer: C

The correct answer is An animal that hunts another animal for food.

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: A predator hunts and eats prey.
  3. Check the choice: The correct choice is An animal that hunts another animal for food.

A predator hunts and eats prey.

4. QuestionMultiple choice

Which organism helps break down a dead tree?

Please select an answer first.

Correct answer: D

The correct answer is A fungus.

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: Fungi are decomposers that break down dead material.
  3. Check the choice: The correct choice is A fungus.

Fungi are decomposers that break down dead material.

5. QuestionMultiple choice

How does a tree provide shelter in an ecosystem?

Please select an answer first.

Correct answer: A

The correct answer is Its branches and leaves can give animals places to hide or nest..

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: Trees can provide shelter and nesting spaces for many organisms.
  3. Check the choice: The correct choice is Its branches and leaves can give animals places to hide or nest..

Trees can provide shelter and nesting spaces for many organisms.

6. QuestionMultiple choice

In the chain algae → insect → fish, what does the insect provide to the fish?

Please select an answer first.

Correct answer: B

The correct answer is Food and energy.

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: The fish gets energy by eating the insect.
  3. Check the choice: The correct choice is Food and energy.

The fish gets energy by eating the insect.

7. QuestionMultiple choice

What may happen when a new species enters an ecosystem?

Please select an answer first.

Correct answer: C

The correct answer is It may change the food and habitat relationships among organisms..

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: A new species can affect available food, shelter, and competition.
  3. Check the choice: The correct choice is It may change the food and habitat relationships among organisms..

A new species can affect available food, shelter, and competition.

8. QuestionMultiple choice

What is the role of a producer in most ecosystems?

Please select an answer first.

Correct answer: D

The correct answer is It makes food that provides energy for other organisms..

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: Producers make food and provide the starting energy for many food chains.
  3. Check the choice: The correct choice is It makes food that provides energy for other organisms..

Producers make food and provide the starting energy for many food chains.

9. QuestionMultiple choice

Why is balance important in an ecosystem?

Please select an answer first.

Correct answer: A

The correct answer is Changes to one population can affect other connected organisms..

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: Organisms are connected through food, shelter, and other relationships.
  3. Check the choice: The correct choice is Changes to one population can affect other connected organisms..

Organisms are connected through food, shelter, and other relationships.

10. QuestionMultiple choice

Which statement best summarizes ecosystem relationships?

Please select an answer first.

Correct answer: B

The correct answer is Organisms depend on one another and on nonliving parts of their habitat..

  1. Read the ecosystem clue: Identify the living things, nonliving factors, or relationship described.
  2. Classify the role: Ecosystems work through relationships among organisms and environmental factors.
  3. Check the choice: The correct choice is Organisms depend on one another and on nonliving parts of their habitat..

Ecosystems work through relationships among organisms and environmental factors.

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Frequently asked questions about Grade 3 Ecosystems

What is an ecosystem?

An ecosystem includes living things and the nonliving parts of an area that interact with one another.

What is the difference between a producer and a consumer?

A producer makes its own food, while a consumer gets energy by eating plants or other organisms.

How many questions are on this page?

The page includes five mini tests with 10 questions each, for 50 Grade 3 Ecosystems questions in total.