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Quiz Chapter 2: Ecosystem

10 questions ยท Form 2 Science Bab 2: Ecosystem

Question 1 of 10Score: 0

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

Full Question List & Answer Key

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

1. 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.

2. 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.

3. Multiple populations of plants, insects, frogs, and snakes interacting together in a pond form a:

  1. Species
  2. Population
  3. Community
  4. Biosphere
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Answer: C

A community consists of various interacting populations of different species sharing a common habitat.

4. 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.

5. 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.

6. 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.

7. Which interaction best describes a bird's nest fern growing on a tall tree branch to get better sunlight?

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

This is commensalism because the fern benefits by gaining sunlight without harming or helping the host tree.

8. 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.

9. 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.

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
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Answer: B

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

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