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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. Which statement accurately describes an advantage of biological control over chemical pesticides?

  1. It acts instantly within minutes of application
  2. It does not cause chemical environmental pollution or pest resistance
  3. It eliminates all species in the target ecosystem
  4. It requires zero monitoring or ecological planning
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Answer: B

Biological control avoids toxic chemical residues, does not pollute water sources, and prevents pests from developing chemical immunity.

2. Which sequence correctly illustrates energy flow in a terrestrial ecosystem?

  1. Sunlight → Paddy plant → Caterpillar → Bird → Eagle
  2. Bird → Caterpillar → Paddy plant → Sunlight
  3. Eagle → Snake → Frog → Caterpillar → Sunlight
  4. Paddy plant → Sun → Bird → Caterpillar
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Answer: A

Energy flows from solar radiation to producers (Paddy plant), then sequentially through primary (Caterpillar), secondary (Bird), and tertiary (Eagle) consumers.

3. 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
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Answer: A

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

4. 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.

5. 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.

6. What primary resource causes competition among plants in a dense rainforest?

  1. Prey animals
  2. Sunlight and soil minerals
  3. Organic decomposers
  4. Atmospheric nitrogen gas
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Answer: B

Rainforest plants compete primarily for sunlight (by growing tall or broad leaves), soil moisture, and mineral nutrients.

7. 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.

8. 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.

9. In a parasitic relationship between a flea and a dog, how are the two organisms affected?

  1. Flea benefits (+), Dog is harmed (-)
  2. Both flea and dog benefit (+/+)
  3. Flea benefits (+), Dog is unaffected (0)
  4. Both flea and dog are harmed (-/-)
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Answer: A

In parasitism, the parasite (flea) benefits by deriving nutrients, while the host (dog) suffers harm.

10. Why are owls introduced into oil palm plantations in Malaysia?

  1. To pollinate oil palm flowers
  2. To act as biological control agents against rats
  3. To decompose fallen leaves
  4. To compete with snakes for nesting space
Show answer

Answer: B

Barn owls are natural predators of rats, providing an environmentally friendly biological control method that eliminates chemical poisons.

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