NumicornNumicornLearn, solve, progress

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.

Select a test

5 Tests
1. Test2. Test3. Test4. Test5. Test

4. 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 carrying capacity?

Please select an answer first.

Correct answer: A

The correct answer is The largest population size an environment can support over time.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Carrying capacity depends on resources, space, disease, predation, and other limiting factors.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Carrying capacity depends on resources, space, disease, predation, and other limiting factors.

2. QuestionMultiple choice

What is a limiting factor?

Please select an answer first.

Correct answer: B

The correct answer is A resource or condition that restricts population growth.

  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, water, space, disease, temperature, and predation can limit how large a population becomes.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Food, water, space, disease, temperature, and predation can limit how large a population becomes.

3. QuestionMultiple choice

What usually happens to population growth when resources become scarce?

Please select an answer first.

Correct answer: C

The correct answer is Population growth slows because competition and death rates may increase..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Scarcity increases competition and can lower survival or reproduction, slowing population growth.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Scarcity increases competition and can lower survival or reproduction, slowing population growth.

4. QuestionMultiple choice

Which process moves carbon from the atmosphere into many plants?

Please select an answer first.

Correct answer: D

The correct answer is Photosynthesis.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Plants use carbon dioxide during photosynthesis to build energy-rich molecules.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Plants use carbon dioxide during photosynthesis to build energy-rich molecules.

5. QuestionMultiple choice

How does cellular respiration return carbon dioxide to the atmosphere?

Please select an answer first.

Correct answer: A

The correct answer is Organisms break down food molecules and release carbon dioxide as a product..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Cellular respiration releases carbon dioxide when cells obtain usable energy from food.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Cellular respiration releases carbon dioxide when cells obtain usable energy from food.

6. QuestionMultiple choice

What role do bacteria play in the nitrogen cycle?

Please select an answer first.

Correct answer: B

The correct answer is Some bacteria convert nitrogen into forms that plants can use or return nitrogen gas to the atmosphere..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Different bacteria perform important conversions among atmospheric, soil, and biologically usable nitrogen forms.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Different bacteria perform important conversions among atmospheric, soil, and biologically usable nitrogen forms.

7. QuestionMultiple choice

What happens during evaporation in the water cycle?

Please select an answer first.

Correct answer: C

The correct answer is Liquid water changes into water vapor..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Evaporation is the change from liquid water to water vapor, often powered by heat from the Sun.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Evaporation is the change from liquid water to water vapor, often powered by heat from the Sun.

8. QuestionMultiple choice

How can deforestation affect an ecosystem?

Please select an answer first.

Correct answer: D

The correct answer is It can remove habitat, reduce biodiversity, and change water and carbon cycling..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Removing trees changes habitat, food webs, soil, water movement, and the movement of carbon.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Removing trees changes habitat, food webs, soil, water movement, and the movement of carbon.

9. QuestionMultiple choice

What is ecological succession?

Please select an answer first.

Correct answer: A

The correct answer is The gradual change in the species and community structure of an area over time.

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Succession follows disturbances or newly formed surfaces as species establish and community conditions change.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Succession follows disturbances or newly formed surfaces as species establish and community conditions change.

10. QuestionMultiple choice

Why can a diverse ecosystem be more stable after a disturbance?

Please select an answer first.

Correct answer: B

The correct answer is Different species may perform overlapping roles, so some functions can continue when one population declines..

  1. Identify the ecosystem idea: Determine whether the question focuses on organisms, resources, energy, population size, interactions, or matter cycling.
  2. Connect the evidence: Biodiversity can provide functional redundancy and increase the chance that some species tolerate the disturbance.
  3. Predict the system effect: Use the relationship among organisms and their environment to select the outcome that best fits the ecosystem model.

Biodiversity can provide functional redundancy and increase the chance that some species tolerate the disturbance.

Previous testNext test