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Grade 6 Science · Ecosystems

Grade 6 Ecosystems Practice Test

Build Grade 6 Science skills with five 10-question practice tests on biotic and abiotic factors, habitats, populations, communities, interactions, carrying capacity, and biodiversity.

Ecosystems Practice Tests

These Grade 6 Science practice tests help students understand how organisms interact with one another and with nonliving parts of their environment. Students practice biotic and abiotic factors, habitats, populations, communities, producers, consumers, decomposers, competition, symbiosis, carrying capacity, biodiversity, and ecosystem change.

Skills covered

  • Identifying biotic and abiotic ecosystem factors
  • Distinguishing organisms, populations, communities, habitats, and ecosystems
  • Explaining the roles of producers, consumers, and decomposers
  • Analyzing competition, predation, symbiosis, and limiting factors
  • Understanding carrying capacity and biodiversity
  • Using observations and data to explain ecosystem changes

How to use these practice tests

Begin by identifying whether each factor is living or nonliving. Then classify the level of organization and examine the relationship described. For population questions, look for resources, limiting factors, evidence of change, and how one population may affect others in the ecosystem.

For more Grade 6 Science practice, return to the Grade 6 Science category.

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Grade 6 Ecosystems Practice Tests

A 10-question Grade 6 Science practice test on ecosystems, biotic and abiotic factors, habitats, populations, communities, interactions, carrying capacity, and biodiversity.

Identify ecosystem components, analyze relationships among organisms and environmental factors, and use evidence to explain population and ecosystem changes.

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

What is carrying capacity?

Please select an answer first.

Correct answer: A

The correct answer is The largest population an environment can support over time with its available resources.

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Carrying capacity depends on resources, space, environmental conditions, and other limiting factors.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Carrying capacity depends on resources, space, environmental conditions, and other limiting factors.

2. QuestionMultiple choice

What may happen when a population grows beyond its carrying capacity?

Please select an answer first.

Correct answer: B

The correct answer is Resources may become scarce and the population may decline..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: A population above carrying capacity may experience increased competition, disease, or starvation.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

A population above carrying capacity may experience increased competition, disease, or starvation.

3. QuestionMultiple choice

Why can an ecosystem usually support more small organisms than large organisms?

Please select an answer first.

Correct answer: C

The correct answer is Small organisms often require fewer resources and less space per individual..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Resource needs influence how many individuals an environment can support.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Resource needs influence how many individuals an environment can support.

4. QuestionMultiple choice

Which factor could raise the carrying capacity for rabbits in a meadow?

Please select an answer first.

Correct answer: D

The correct answer is An increase in available food and shelter.

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: More food and shelter provide resources that can support a larger rabbit population.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

More food and shelter provide resources that can support a larger rabbit population.

5. QuestionMultiple choice

What is biodiversity?

Please select an answer first.

Correct answer: A

The correct answer is The variety of living organisms in an area.

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Biodiversity includes the variety of species and living forms in an ecosystem.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Biodiversity includes the variety of species and living forms in an ecosystem.

6. QuestionMultiple choice

Why can biodiversity help an ecosystem remain stable?

Please select an answer first.

Correct answer: B

The correct answer is Different organisms can fill different roles and support ecosystem functions..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: A variety of organisms can make an ecosystem more resilient when conditions change.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

A variety of organisms can make an ecosystem more resilient when conditions change.

7. QuestionMultiple choice

What is an invasive species?

Please select an answer first.

Correct answer: C

The correct answer is A nonnative organism that spreads and causes harm in a new ecosystem.

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Invasive species can disrupt food, habitat, and other relationships in the new ecosystem.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Invasive species can disrupt food, habitat, and other relationships in the new ecosystem.

8. QuestionMultiple choice

How can removing a top predator affect an ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is Some prey populations may increase and change plant or smaller-animal populations..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Predators help regulate prey populations, so their removal can cause a cascade of changes.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Predators help regulate prey populations, so their removal can cause a cascade of changes.

9. QuestionMultiple choice

Which action could protect biodiversity in a local wetland?

Please select an answer first.

Correct answer: A

The correct answer is Protect habitats and reduce pollution entering the wetland..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Habitat protection and pollution reduction support a wider variety of organisms.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Habitat protection and pollution reduction support a wider variety of organisms.

10. QuestionMultiple choice

Why should scientists monitor population sizes over time?

Please select an answer first.

Correct answer: B

The correct answer is Long-term data can show changes, trends, and possible effects of environmental conditions..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Repeated measurements help scientists identify trends and evaluate ecosystem changes.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Repeated measurements help scientists identify trends and evaluate ecosystem changes.

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Frequently asked questions about Grade 6 Ecosystems

What topics are covered?

The page covers biotic and abiotic factors, habitats, populations, communities, producers, consumers, decomposers, interactions, limiting factors, carrying capacity, biodiversity, and ecosystem investigations.

How should students study ecosystems?

Practice classifying living and nonliving factors, tracing relationships among organisms, and explaining how resources and environmental changes affect populations.

How many questions are on this page?

The page includes five mini tests with 10 questions each, for 50 Grade 6 Ecosystems questions in total.