10 questions ยท Form 2 Science Bab 2: Ecosystem
Which process is the primary pathway that consumes carbon dioxide and releases oxygen back into the atmosphere?
Prefer reading to quizzing? All 10 questions are listed below with the answer and explanation under each one.
1. Which process is the primary pathway that consumes carbon dioxide and releases oxygen back into the atmosphere?
Answer: C
Photosynthesis is the sole biological process that absorbs carbon dioxide and generates oxygen gas.
2. Roughly what percentage of energy is transferred from one trophic level to the next in a food chain?
Answer: C
Only about 10% of energy is passed to the next trophic level, as 90% is lost through heat, respiration, movement, and excretion.
3. What is the natural environment where an organism lives and finds food, protection, and shelter called?
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?
Answer: B
Transpiration is the process where plants evaporate excess water vapor through leaf stomata into the atmosphere.
5. Which statement accurately describes an advantage of biological control over chemical pesticides?
Answer: B
Biological control avoids toxic chemical residues, does not pollute water sources, and prevents pests from developing chemical immunity.
6. Multiple populations of plants, insects, frogs, and snakes interacting together in a pond form a:
Answer: C
A community consists of various interacting populations of different species sharing a common habitat.
7. A group of zebra living together in the savanna at the same time represents which ecological level?
Answer: C
A population is defined as a group of organisms of the same species living in the same habitat simultaneously.
8. Which step helps restore nutrient cycles in an area impacted by severe deforestation?
Answer: A
Reforestation restores plant cover, re-establishing photosynthesis and restoring stability to the carbon, oxygen, and water cycles.
9. Lichens consist of an alga and a fungus living closely together. What type of symbiotic relationship is this?
Answer: C
This is mutualism (+/+): the alga synthesizes food via photosynthesis, while the fungus provides structural protection and moisture retention.
10. Which interaction best describes a bird's nest fern growing on a tall tree branch to get better sunlight?
Answer: B
This is commensalism because the fern benefits by gaining sunlight without harming or helping the host tree.