Energy flow and nutrient cycles MCQs

By: Prof. Dr. Fazal Rehman | Last updated: June 10, 2025

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1. : What is the primary source of energy for most ecosystems?



2. : Which process do plants use to convert solar energy into chemical energy?



3. : In an ecosystem, what percentage of energy is typically transferred from one trophic level to the next?



4. : What is the role of primary consumers in an ecosystem?



5. : Which nutrient cycle involves the process of nitrogen fixation?



6. : What is the process by which water vapor returns to Earth’s surface as precipitation?



7. : Which of the following best describes a decomposer’s role in nutrient cycling?



8. : In the carbon cycle, how is carbon released back into the atmosphere?



9. : What term describes the continuous movement of water on, above, and below the surface of the Earth?



10. : In which part of the nutrient cycle do plants absorb nutrients from the soil?



 

 

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