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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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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 the original energy source for most ecosystems?

Please select an answer first.

Correct answer: A

The correct answer is The Sun.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Most ecosystems receive energy from sunlight, which producers capture through photosynthesis.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Most ecosystems receive energy from sunlight, which producers capture through photosynthesis.

2. QuestionMultiple choice

What does a food chain show?

Please select an answer first.

Correct answer: B

The correct answer is One path of energy transfer through feeding relationships.

  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 food chain follows one sequence from a producer through consumers.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

A food chain follows one sequence from a producer through consumers.

3. QuestionMultiple choice

What does a food web show?

Please select an answer first.

Correct answer: C

The correct answer is Many connected food chains 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: Food webs show that organisms often eat more than one type of food and may have several predators.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Food webs show that organisms often eat more than one type of food and may have several predators.

4. QuestionMultiple choice

What is a trophic level?

Please select an answer first.

Correct answer: D

The correct answer is A feeding position in a food chain or food web.

  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, primary consumers, secondary consumers, and higher consumers occupy different trophic levels.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Producers, primary consumers, secondary consumers, and higher consumers occupy different trophic levels.

5. QuestionMultiple choice

Why is less energy available at higher trophic levels?

Please select an answer first.

Correct answer: A

The correct answer is Organisms use much of the energy they obtain for life processes, and only some is transferred when they are eaten..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Energy is lost as heat and used for movement, growth, repair, and other life processes at each transfer.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Energy is lost as heat and used for movement, growth, repair, and other life processes at each transfer.

6. QuestionMultiple choice

In the chain grass → rabbit → fox, what is the rabbit?

Please select an answer first.

Correct answer: B

The correct answer is A primary consumer.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: The rabbit eats the producer grass, so it is a primary consumer.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

The rabbit eats the producer grass, so it is a primary consumer.

7. QuestionMultiple choice

In the chain algae → insect larva → fish → heron, which organism is at the highest listed trophic level?

Please select an answer first.

Correct answer: C

The correct answer is The heron.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: The heron eats the fish and occupies the highest listed consumer level in this chain.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

The heron eats the fish and occupies the highest listed consumer level in this chain.

8. QuestionMultiple choice

What would most directly happen if producers disappeared from a food web?

Please select an answer first.

Correct answer: D

The correct answer is Energy input would fall and consumers would eventually lose their food source..

  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 introduce energy into the food web, so their loss affects every dependent consumer.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Producers introduce energy into the food web, so their loss affects every dependent consumer.

9. QuestionMultiple choice

How do decomposers support producers?

Please select an answer first.

Correct answer: A

The correct answer is They release nutrients from dead matter that plants can reuse..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Decomposition returns nutrients to soil or water, supporting new producer growth.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Decomposition returns nutrients to soil or water, supporting new producer growth.

10. QuestionMultiple choice

Why can removing one species affect many other species in a food web?

Please select an answer first.

Correct answer: B

The correct answer is The species may be both a food source and a predator or competitor for other organisms..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Connected feeding and competition relationships allow changes in one population to spread through the web.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Connected feeding and competition relationships allow changes in one population to spread through the web.

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