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Ecosystem Dynamics Practice Tests

These Grade 7 Science practice tests build understanding of ecosystem components, energy flow, food chains, food webs, population interactions, carrying capacity, matter cycles, disturbances, and conservation.

Skills covered

  • Distinguishing biotic and abiotic factors, habitats, niches, populations, communities, and ecosystems
  • Tracing energy through producers, consumers, decomposers, food chains, and food webs
  • Explaining predation, competition, mutualism, parasitism, commensalism, and keystone species
  • Connecting limiting factors and carrying capacity to population change
  • Applying carbon, nitrogen, and water cycle ideas to ecosystem and conservation scenarios

How to use these practice tests

For each question, identify the organisms and environmental conditions involved. Then trace the direction of energy, matter, or population change before choosing the best-supported outcome.

For more Grade 7 Science practice, return to the Grade 7 Science category.

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1. Test

Grade 7 Ecosystem Dynamics Practice Tests

Practice Grade 7 Science ecosystem dynamics questions about energy flow, food webs, interactions, populations, cycles, and conservation.

Choose the best answer for each question. Review the explanation after submitting your answers.

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

What is an ecosystem?

Please select an answer first.

Correct answer: A

The correct answer is A community of organisms and the nonliving environment with which they interact.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: An ecosystem includes living organisms, nonliving factors, and the interactions connecting them.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

An ecosystem includes living organisms, nonliving factors, and the interactions connecting them.

2. QuestionMultiple choice

Which is a biotic factor in a pond ecosystem?

Please select an answer first.

Correct answer: B

The correct answer is Algae.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Biotic factors are living or once-living parts of an ecosystem; algae are living organisms.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Biotic factors are living or once-living parts of an ecosystem; algae are living organisms.

3. QuestionMultiple choice

Which is an abiotic factor?

Please select an answer first.

Correct answer: C

The correct answer is The amount of sunlight reaching a forest floor.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Abiotic factors are nonliving conditions such as light, temperature, water, soil, and pH.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Abiotic factors are nonliving conditions such as light, temperature, water, soil, and pH.

4. QuestionMultiple choice

What is a population?

Please select an answer first.

Correct answer: D

The correct answer is All members of one species living in the same area.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: A population consists of organisms of the same species that occupy an area at the same time.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

A population consists of organisms of the same species that occupy an area at the same time.

5. QuestionMultiple choice

What is a community?

Please select an answer first.

Correct answer: A

The correct answer is All the different populations living and interacting in an area.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: A community includes multiple interacting populations, while an ecosystem also includes abiotic factors.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

A community includes multiple interacting populations, while an ecosystem also includes abiotic factors.

6. QuestionMultiple choice

What is a habitat?

Please select an answer first.

Correct answer: B

The correct answer is The place and conditions where an organism normally lives.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: A habitat provides the physical space and conditions an organism needs to live.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

A habitat provides the physical space and conditions an organism needs to live.

7. QuestionMultiple choice

What is a niche?

Please select an answer first.

Correct answer: C

The correct answer is The role and resource use of an organism in its ecosystem.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: A niche describes how an organism uses resources, interacts with other organisms, and functions in its environment.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

A niche describes how an organism uses resources, interacts with other organisms, and functions in its environment.

8. QuestionMultiple choice

Which organism is a producer?

Please select an answer first.

Correct answer: D

The correct answer is A grass plant that makes sugar using sunlight.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Producers make their own food, usually through photosynthesis, and form the base of many food webs.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Producers make their own food, usually through photosynthesis, and form the base of many food webs.

9. QuestionMultiple choice

What is a decomposer's role?

Please select an answer first.

Correct answer: A

The correct answer is Breaking down dead matter and returning nutrients to the environment.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Decomposers such as fungi and bacteria break down organic matter and release nutrients.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Decomposers such as fungi and bacteria break down organic matter and release nutrients.

10. QuestionMultiple choice

Why are interactions between biotic and abiotic factors important?

Please select an answer first.

Correct answer: B

The correct answer is They help determine which organisms can survive and reproduce in an ecosystem..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Living things depend on nonliving conditions, and organisms can also change conditions such as soil, water, and air.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Living things depend on nonliving conditions, and organisms can also change conditions such as soil, water, and air.

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