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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

Which statement best describes matter in an ecosystem?

Please select an answer first.

Correct answer: A

The correct answer is Matter can be reused and moved among organisms and the environment..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Materials such as water, carbon, and nutrients cycle through living and nonliving parts.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Materials such as water, carbon, and nutrients cycle through living and nonliving parts.

2. QuestionMultiple choice

Why are soil organisms important to many ecosystems?

Please select an answer first.

Correct answer: B

The correct answer is They help decompose material, recycle nutrients, and affect soil conditions..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Soil organisms contribute to decomposition, nutrient availability, and healthy soil structure.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Soil organisms contribute to decomposition, nutrient availability, and healthy soil structure.

3. QuestionMultiple choice

Which change would most likely reduce plant growth in a pond ecosystem?

Please select an answer first.

Correct answer: C

The correct answer is A major decrease in available sunlight.

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Less sunlight can limit photosynthesis and reduce the energy available to pond plants.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Less sunlight can limit photosynthesis and reduce the energy available to pond plants.

4. QuestionMultiple choice

How can pollution affect an ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is It can change environmental conditions and harm organisms or their resources..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Pollution can alter water, air, or soil and disrupt living communities.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Pollution can alter water, air, or soil and disrupt living communities.

5. QuestionMultiple choice

Which evidence best shows that a pond is a functioning ecosystem?

Please select an answer first.

Correct answer: A

The correct answer is Measurements show organisms interacting with water, sunlight, nutrients, and one another..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: An ecosystem is supported by evidence of connected living and nonliving components.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

An ecosystem is supported by evidence of connected living and nonliving components.

6. QuestionMultiple choice

Why might a population increase after a new food source appears?

Please select an answer first.

Correct answer: B

The correct answer is More food can improve survival and reproduction for organisms that use it..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: A new resource can support more individuals, at least until another factor becomes limiting.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

A new resource can support more individuals, at least until another factor becomes limiting.

7. QuestionMultiple choice

Which question would help investigate a forest ecosystem?

Please select an answer first.

Correct answer: C

The correct answer is How does the amount of rainfall affect the number of young trees?.

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: The question connects an abiotic factor with a measurable population change.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

The question connects an abiotic factor with a measurable population change.

8. QuestionMultiple choice

What should a scientist do when data show an unexpected ecosystem change?

Please select an answer first.

Correct answer: D

The correct answer is Check the measurements, consider possible causes, and collect more evidence..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: Unexpected results should lead to careful checking and further investigation.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

Unexpected results should lead to careful checking and further investigation.

9. QuestionMultiple choice

Which conclusion is best supported by evidence that a lake has fewer fish after pollution increased?

Please select an answer first.

Correct answer: A

The correct answer is The pollution may have changed lake conditions in a way that harmed fish or their resources..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: The conclusion is cautious and connects the observed change to a possible environmental effect.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

The conclusion is cautious and connects the observed change to a possible environmental effect.

10. QuestionMultiple choice

Which checklist best evaluates an ecosystem investigation?

Please select an answer first.

Correct answer: B

The correct answer is Identify living and nonliving factors, measure relationships, record data, and explain evidence..

  1. Identify the ecosystem concept: Determine whether the question asks about an organism, population, community, habitat, or environmental factor.
  2. Use the relationship: A strong investigation identifies components, collects evidence, and explains relationships carefully.
  3. Check the system: Consider how living and nonliving parts interact and affect the stability of the ecosystem.

A strong investigation identifies components, collects evidence, and explains relationships carefully.

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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.