Energy transferred in ecosystems Quiz
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5 questions, one answer each
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1. In a food chain, why is energy lost when organisms move from one trophic level to the next?
- A. Energy is used in respiration, lost as heat, and some is removed from the ecosystem through egestion and excretion
- B. Plants absorb more sunlight than animals can use
- C. Decomposers remove all the energy before it reaches the next level
- D. Energy is converted into inorganic compounds that animals cannot use
2. Which process is responsible for returning carbon from the atmosphere into organisms in the carbon cycle?
- A. Respiration
- B. Photosynthesis
- C. Decomposition
- D. Combustion
3. If grass contains 50,000 kJ of energy, and herbivores that eat the grass store approximately 10% of this energy, how much energy is stored in the herbivores?
- A. 5,000 kJ
- B. 10,000 kJ
- C. 45,000 kJ
- D. 50,000 kJ
4. In the nitrogen cycle, which process converts atmospheric nitrogen into nitrates that plants can absorb?
- A. Denitrification by bacteria in the soil
- B. Nitrogen fixation by specialised bacteria, followed by nitrification
- C. Photosynthesis by plants
- D. Respiration by decomposers
5. Water moves through an ecosystem via evaporation, condensation, precipitation, and transpiration. Which of these processes directly requires energy from the Sun?
- A. Condensation and precipitation only
- B. Evaporation and transpiration only
- C. All four processes equally
- D. Precipitation only