20 Ecosystem Quiz Questions and Answers

An ecosystem is a dynamic and interconnected community of living organisms, including plants, animals, microorganisms, and fungi, interacting with each other and their non-living environment, such as soil, water, air, sunlight, and climate. These interactions form a balanced system where energy flows through food chains and webs, nutrients cycle through processes like decomposition, and biodiversity ensures resilience against changes. For instance, a forest ecosystem features towering trees providing habitat for wildlife, while rivers within it support aquatic life, all working together to maintain ecological stability and sustain life.

Table of contents

Part 1: Best AI quiz making software for creating a ecosystem quiz

Nowadays more and more people create ecosystem quizzes using AI technologies, OnlineExamMaker a powerful AI-based quiz making tool that can save you time and efforts. The software makes it simple to design and launch interactive quizzes, assessments, and surveys. With the Question Editor, you can create multiple-choice, open-ended, matching, sequencing and many other types of questions for your tests, exams and inventories. You are allowed to enhance quizzes with multimedia elements like images, audio, and video to make them more interactive and visually appealing.

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● Randomize questions or change the order of questions to ensure exam takers don’t get the same set of questions each time.

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Part 2: 20 ecosystem quiz questions & answers

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1. Question: What is an ecosystem?
A. A community of living organisms and their physical environment
B. Only the plants in a forest
C. A group of animals in a zoo
D. The weather patterns of a region
Answer: A
Explanation: An ecosystem includes both living (biotic) and non-living (abiotic) components that interact, such as organisms and their environment, forming a functional unit.

2. Question: Which of the following is a biotic factor in an ecosystem?
A. Sunlight
B. Temperature
C. Plants
D. Soil minerals
Answer: C
Explanation: Biotic factors are living components, and plants are living organisms that interact with other elements in the ecosystem.

3. Question: What role do producers play in an ecosystem?
A. They consume other organisms
B. They break down dead matter
C. They make their own food using sunlight
D. They hunt for prey
Answer: C
Explanation: Producers, like plants, perform photosynthesis to create energy, forming the base of the food chain.

4. Question: In a food chain, what comes after the producers?
A. Decomposers
B. Primary consumers
C. Secondary consumers
D. Tertiary consumers
Answer: B
Explanation: Primary consumers eat producers, such as herbivores eating plants, to transfer energy through the food chain.

5. Question: What is the primary source of energy for most ecosystems?
A. Wind
B. The sun
C. Water
D. Soil
Answer: B
Explanation: The sun provides energy for photosynthesis, which drives the energy flow in most ecosystems.

6. Question: Which process describes the movement of water through an ecosystem?
A. Carbon cycle
B. Nitrogen cycle
C. Water cycle
D. Energy cycle
Answer: C
Explanation: The water cycle involves evaporation, condensation, and precipitation, recycling water in the ecosystem.

7. Question: What is biodiversity?
A. The variety of non-living things in an area
B. The number of ecosystems on Earth
C. The variety of life forms in an ecosystem
D. The amount of sunlight in a habitat
Answer: C
Explanation: Biodiversity refers to the range of species, genetic variations, and ecosystems, which supports ecosystem stability.

8. Question: In an energy pyramid, why is energy lost at each level?
A. It is converted to heat
B. It is stored in the soil
C. It increases with each level
D. It is recycled back to producers
Answer: A
Explanation: Energy is lost as heat during metabolic processes, so only about 10% is transferred to the next trophic level.

9. Question: What is ecological succession?
A. The rapid growth of plants in a desert
B. The process by which an ecosystem changes over time
C. The migration of animals to new areas
D. The decrease in biodiversity
Answer: B
Explanation: Ecological succession is the gradual change in species composition, such as from a barren land to a forest.

10. Question: Which biome is characterized by low temperatures and permafrost?
A. Desert
B. Tundra
C. Tropical rainforest
D. Grassland
Answer: B
Explanation: The tundra biome has permanently frozen soil and cold conditions, supporting limited plant and animal life.

11. Question: How do decomposers contribute to ecosystems?
A. By producing oxygen
B. By breaking down dead organisms and recycling nutrients
C. By consuming plants
D. By providing shade
Answer: B
Explanation: Decomposers like bacteria and fungi recycle nutrients back into the soil, making them available for producers.

12. Question: What is a keystone species?
A. A species that is the largest in its ecosystem
B. A species whose removal causes major changes in the ecosystem
C. A species that migrates seasonally
D. A species that only eats plants
Answer: B
Explanation: Keystone species, like wolves in a forest, have a disproportionate impact on their environment, maintaining balance.

13. Question: In the carbon cycle, how is carbon returned to the atmosphere?
A. Through photosynthesis
B. Through respiration and combustion
C. Through erosion
D. Through evaporation
Answer: B
Explanation: Respiration by organisms and burning of fossil fuels release carbon dioxide back into the atmosphere.

14. Question: What effect does deforestation have on an ecosystem?
A. It increases biodiversity
B. It leads to soil erosion and loss of habitat
C. It cools the climate
D. It promotes rapid plant growth
Answer: B
Explanation: Deforestation removes trees, which hold soil in place and support wildlife, leading to erosion and habitat loss.

15. Question: Which factor is abiotic in a freshwater ecosystem?
A. Fish
B. Algae
C. pH level of water
D. Insects
Answer: C
Explanation: Abiotic factors are non-living, and the pH level is a chemical property of the water, not a living organism.

16. Question: What is symbiosis?
A. A type of plant growth
B. A close, long-term interaction between two different species
C. The process of decomposition
D. A food chain disruption
Answer: B
Explanation: Symbiosis includes relationships like mutualism, where both species benefit, such as bees and flowers.

17. Question: How does pollution affect aquatic ecosystems?
A. It increases fish populations
B. It can lead to algal blooms and oxygen depletion
C. It enhances water clarity
D. It promotes new species introduction
Answer: B
Explanation: Pollution from nutrients can cause excessive algal growth, which depletes oxygen when it decomposes, harming aquatic life.

18. Question: What is the difference between a food chain and a food web?
A. A food chain is simpler and linear, while a food web is more complex and interconnected
B. A food chain involves only plants
C. A food web is only in oceans
D. There is no difference
Answer: A
Explanation: A food chain shows a single path of energy transfer, while a food web illustrates multiple interconnected chains in an ecosystem.

19. Question: In a desert ecosystem, what adaptation helps animals survive?
A. Thick fur for warmth
B. Ability to store water, like in camels
C. Large leaves for photosynthesis
D. Dependence on frequent rain
Answer: B
Explanation: Desert animals adapt to scarce water by storing it in their bodies, allowing them to survive in arid conditions.

20. Question: How do human activities contribute to climate change in ecosystems?
A. By increasing forest cover
B. By releasing greenhouse gases that alter global temperatures
C. By reducing pollution levels
D. By enhancing biodiversity
Answer: B
Explanation: Activities like burning fossil fuels release carbon dioxide, trapping heat and disrupting ecosystem balances worldwide.

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