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Ecosystems and Biodiversity Practice Tests

These Grade 9 Biology practice tests explore how biodiversity supports ecosystem structure, function, and resilience. Questions cover genetic, species, and ecosystem diversity; keystone species; ecosystem services; habitat loss; invasive species; pollution; climate change; restoration; and conservation.

Skills covered

  • Distinguishing genetic, species, and ecosystem biodiversity and explaining resilience and resistance
  • Analyzing keystone species, indicator species, trophic cascades, decomposers, and ecosystem services
  • Evaluating habitat loss, fragmentation, edge effects, invasive species, eutrophication, plastic pollution, and climate change
  • Connecting ecological footprints, sustainability, protected areas, corridors, restoration, and native species
  • Interpreting population, food-web, biodiversity, and ecosystem-health evidence for conservation decisions

How to use these practice tests

First identify the ecological level or biodiversity type. Then trace the direct and indirect effects of a disturbance and consider which evidence would support a conservation decision. Review the explanations to strengthen environmental science vocabulary and systems thinking.

For more Grade 9 Science practice, return to the Grade 9 Science category.

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Grade 9 Ecosystems and Biodiversity Practice Tests

Practice Grade 9 Science questions about biodiversity, ecosystem structure, keystone species, ecosystem services, habitat loss, pollution, climate change, and conservation.

Choose the best answer. Identify the level of biodiversity or ecosystem process involved, trace direct and indirect effects, and evaluate conservation choices.

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

What is an ecological footprint?

Please select an answer first.

Correct answer: A

The correct answer is An estimate of how much biologically productive land and water a person or population uses..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: An ecological footprint estimates resource use and waste production in relation to the productive area needed to support it.
  3. Check the answer: The correct answer is An estimate of how much biologically productive land and water a person or population uses..

An ecological footprint estimates resource use and waste production in relation to the productive area needed to support it.

2. QuestionMultiple choice

How can reducing energy use help ecosystems?

Please select an answer first.

Correct answer: B

The correct answer is It can reduce resource extraction, pollution, and greenhouse-gas emissions..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Using less energy, especially from fossil fuels, can lower pollution and pressure on habitats and climate.
  3. Check the answer: The correct answer is It can reduce resource extraction, pollution, and greenhouse-gas emissions..

Using less energy, especially from fossil fuels, can lower pollution and pressure on habitats and climate.

3. QuestionMultiple choice

What is sustainable resource use?

Please select an answer first.

Correct answer: C

The correct answer is Using resources at a rate that allows them to remain available for future generations..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Sustainability balances present needs with the capacity of ecosystems to renew resources and absorb impacts.
  3. Check the answer: The correct answer is Using resources at a rate that allows them to remain available for future generations..

Sustainability balances present needs with the capacity of ecosystems to renew resources and absorb impacts.

4. QuestionMultiple choice

What is a protected area?

Please select an answer first.

Correct answer: D

The correct answer is A region managed to conserve habitats, species, or ecological processes..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: National parks, wildlife refuges, and marine reserves are examples of protected areas with conservation goals.
  3. Check the answer: The correct answer is A region managed to conserve habitats, species, or ecological processes..

National parks, wildlife refuges, and marine reserves are examples of protected areas with conservation goals.

5. QuestionMultiple choice

Why can wildlife corridors improve conservation?

Please select an answer first.

Correct answer: A

The correct answer is They connect isolated habitats and allow movement, migration, and gene flow..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Connected habitat can reduce isolation and help populations access food, shelter, mates, and seasonal ranges.
  3. Check the answer: The correct answer is They connect isolated habitats and allow movement, migration, and gene flow..

Connected habitat can reduce isolation and help populations access food, shelter, mates, and seasonal ranges.

6. QuestionMultiple choice

What is ecological restoration?

Please select an answer first.

Correct answer: B

The correct answer is The process of helping a damaged ecosystem recover its structure and function..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Restoration may remove stressors, reestablish native species, repair soil and water, and rebuild ecological processes.
  3. Check the answer: The correct answer is The process of helping a damaged ecosystem recover its structure and function..

Restoration may remove stressors, reestablish native species, repair soil and water, and rebuild ecological processes.

7. QuestionMultiple choice

Why is using native species often important in restoration?

Please select an answer first.

Correct answer: C

The correct answer is Native species are adapted to local conditions and support local food-web relationships..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Native organisms fit local climate, soil, and interactions and can help rebuild the original community.
  3. Check the answer: The correct answer is Native species are adapted to local conditions and support local food-web relationships..

Native organisms fit local climate, soil, and interactions and can help rebuild the original community.

8. QuestionMultiple choice

What is a conservation easement?

Please select an answer first.

Correct answer: D

The correct answer is A legal agreement that limits certain land uses to protect conservation values..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: A conservation easement can keep land in private ownership while restricting development or other harmful uses.
  3. Check the answer: The correct answer is A legal agreement that limits certain land uses to protect conservation values..

A conservation easement can keep land in private ownership while restricting development or other harmful uses.

9. QuestionMultiple choice

Why do scientists monitor biodiversity over time?

Please select an answer first.

Correct answer: A

The correct answer is Long-term data can reveal population trends, threats, and whether conservation actions work..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Repeated surveys help detect changes, evaluate management, and identify emerging problems.
  3. Check the answer: The correct answer is Long-term data can reveal population trends, threats, and whether conservation actions work..

Repeated surveys help detect changes, evaluate management, and identify emerging problems.

10. QuestionMultiple choice

Which approach best supports ecosystem-based conservation?

Please select an answer first.

Correct answer: B

The correct answer is Protecting connected habitats while considering species interactions, resources, and human communities..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Ecosystem-based conservation protects processes and relationships rather than treating species as isolated units.
  3. Check the answer: The correct answer is Protecting connected habitats while considering species interactions, resources, and human communities..

Ecosystem-based conservation protects processes and relationships rather than treating species as isolated units.

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