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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

Which is an ecosystem service provided by wetlands?

Please select an answer first.

Correct answer: A

The correct answer is Flood control and water filtration..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Wetlands absorb excess water, trap sediment, filter pollutants, and provide habitat.
  3. Check the answer: The correct answer is Flood control and water filtration..

Wetlands absorb excess water, trap sediment, filter pollutants, and provide habitat.

2. QuestionMultiple choice

What is pollination an example of?

Please select an answer first.

Correct answer: B

The correct answer is An ecosystem service that supports plant reproduction and food production..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Pollinators transfer pollen, supporting reproduction in many plants and crops.
  3. Check the answer: The correct answer is An ecosystem service that supports plant reproduction and food production..

Pollinators transfer pollen, supporting reproduction in many plants and crops.

3. QuestionMultiple choice

What is a provisioning ecosystem service?

Please select an answer first.

Correct answer: C

The correct answer is A material or resource obtained from an ecosystem, such as food or timber..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Provisioning services include food, fresh water, fuel, fibers, and other products supplied by ecosystems.
  3. Check the answer: The correct answer is A material or resource obtained from an ecosystem, such as food or timber..

Provisioning services include food, fresh water, fuel, fibers, and other products supplied by ecosystems.

4. QuestionMultiple choice

What is a regulating ecosystem service?

Please select an answer first.

Correct answer: D

The correct answer is A natural process that helps control conditions such as climate, floods, or disease..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Regulating services include climate regulation, flood control, water purification, and disease regulation.
  3. Check the answer: The correct answer is A natural process that helps control conditions such as climate, floods, or disease..

Regulating services include climate regulation, flood control, water purification, and disease regulation.

5. QuestionMultiple choice

What is a cultural ecosystem service?

Please select an answer first.

Correct answer: A

The correct answer is A nonmaterial benefit such as recreation, education, or cultural value..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Natural areas provide cultural, recreational, educational, spiritual, and aesthetic benefits.
  3. Check the answer: The correct answer is A nonmaterial benefit such as recreation, education, or cultural value..

Natural areas provide cultural, recreational, educational, spiritual, and aesthetic benefits.

6. QuestionMultiple choice

Why can removing a keystone predator change an entire community?

Please select an answer first.

Correct answer: B

The correct answer is Prey populations may increase and alter vegetation and other 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: A keystone predator can regulate prey and prevent one species from dominating the community.
  3. Check the answer: The correct answer is Prey populations may increase and alter vegetation and other food-web relationships..

A keystone predator can regulate prey and prevent one species from dominating the community.

7. QuestionMultiple choice

Why are decomposers essential to ecosystem function?

Please select an answer first.

Correct answer: C

The correct answer is They return nutrients from dead matter and waste to forms that can reenter cycles..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Decomposers break down organic material and make nutrients available to producers and other organisms.
  3. Check the answer: The correct answer is They return nutrients from dead matter and waste to forms that can reenter cycles..

Decomposers break down organic material and make nutrients available to producers and other organisms.

8. QuestionMultiple choice

What is a trophic cascade?

Please select an answer first.

Correct answer: D

The correct answer is A change at one trophic level that causes effects through several other levels..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Changes in predators, herbivores, or producers can cascade through connected food-web relationships.
  3. Check the answer: The correct answer is A change at one trophic level that causes effects through several other levels..

Changes in predators, herbivores, or producers can cascade through connected food-web relationships.

9. QuestionMultiple choice

Why can habitat protection preserve ecosystem services?

Please select an answer first.

Correct answer: A

The correct answer is Protecting habitats maintains the organisms and processes that provide those benefits..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Healthy habitats support pollination, water purification, carbon storage, food production, and other services.
  3. Check the answer: The correct answer is Protecting habitats maintains the organisms and processes that provide those benefits..

Healthy habitats support pollination, water purification, carbon storage, food production, and other services.

10. QuestionMultiple choice

How can the loss of one plant species affect ecosystem services?

Please select an answer first.

Correct answer: B

The correct answer is It may reduce food, habitat, pollination opportunities, or other functions connected to that plant..

  1. Identify the ecosystem concept: Determine whether the question focuses on biodiversity, ecosystem structure, environmental change, or conservation.
  2. Apply the ecological principle: Plants support food webs, soil stability, carbon storage, and habitat, so their loss can have multiple effects.
  3. Check the answer: The correct answer is It may reduce food, habitat, pollination opportunities, or other functions connected to that plant..

Plants support food webs, soil stability, carbon storage, and habitat, so their loss can have multiple effects.

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