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Quiz Chapter 2: Ecosystem

10 questions · Form 2 Science Bab 2: Ecosystem

10 questions · plays in fullscreen

Full Question List & Answer Key

Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.

1. What is the primary ecological role of decomposers like bacteria and fungi?

  1. Producing oxygen through anaerobic respiration
  2. Breaking down complex organic waste into simple nutrients for plants
  3. Controlling secondary consumer populations
  4. Capturing solar energy to synthesize glucose
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Answer: B

Decomposers recycle dead organic matter back into simple inorganic nutrients absorbed by plant roots.

2. What happens to a food web if all primary consumers are completely removed?

  1. Producer population decreases drastically
  2. Secondary consumers face starvation due to lack of food
  3. Decomposer activity stops completely
  4. Energy flow rate increases across all trophic levels
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Answer: B

Secondary consumers feed on primary consumers; removing primary consumers deprives secondary consumers of their food source.

3. What is the natural environment where an organism lives and finds food, protection, and shelter called?

  1. Community
  2. Habitat
  3. Trophic level
  4. Population
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Answer: B

A habitat is the natural living place or environment that provides an organism's survival necessities.

4. How does water return from plant leaves into the atmosphere during the water cycle?

  1. Condensation
  2. Transpiration
  3. Precipitation
  4. Sublimation
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Answer: B

Transpiration is the process where plants evaporate excess water vapor through leaf stomata into the atmosphere.

5. Which factor is an abiotic (non-living) component of an ecosystem?

  1. Earthworms
  2. Fungi
  3. Sunlight
  4. Bacteria
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Answer: C

Abiotic factors are non-living physical components such as sunlight, temperature, water, air, and soil pH.

6. Which process is the primary pathway that consumes carbon dioxide and releases oxygen back into the atmosphere?

  1. Respiration
  2. Combustion
  3. Photosynthesis
  4. Decomposition
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Answer: C

Photosynthesis is the sole biological process that absorbs carbon dioxide and generates oxygen gas.

7. Which component in a food chain converts light energy into chemical energy?

  1. Primary Consumer
  2. Producer
  3. Decomposer
  4. Tertiary Consumer
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Answer: B

Producers (green plants) carry out photosynthesis, converting light energy into chemical energy stored as glucose.

8. Which human activity directly contributes to an increase in global carbon dioxide levels and global warming?

  1. Replanting deforested trees
  2. Uncontrolled burning of fossil fuels and deforestation
  3. Enforcing strict fishing quotas
  4. Practicing crop rotation
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Answer: B

Burning fossil fuels releases excess carbon dioxide while deforestation reduces the trees available to absorb it.

9. Lichens consist of an alga and a fungus living closely together. What type of symbiotic relationship is this?

  1. Parasitism
  2. Commensalism
  3. Mutualism
  4. Prey-Predator
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Answer: C

This is mutualism (+/+): the alga synthesizes food via photosynthesis, while the fungus provides structural protection and moisture retention.

10. Which step helps restore nutrient cycles in an area impacted by severe deforestation?

  1. Reforestation and tree planting programs
  2. Increasing chemical fertilizer application
  3. Burning remaining stump vegetation
  4. Converting land into industrial parks
Show answer

Answer: A

Reforestation restores plant cover, re-establishing photosynthesis and restoring stability to the carbon, oxygen, and water cycles.

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