Productivity and energy transfer Quiz
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5 questions, one answer each
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1. A crop has a GPP of 800 kJ m⁻² year⁻¹ and respiration of 300 kJ m⁻² year⁻¹. What is the NPP?
- A. 1 100
- B. 500
- C. 300
- D. 800
2. Producers have 20 000 kJ m⁻² year⁻¹ and the primary consumers 2 000 kJ m⁻² year⁻¹. What is the efficiency of transfer?
- A. 1%
- B. 10%
- C. 90%
- D. 100%
3. Which is the main way in which energy is lost from a primary consumer to the environment?
- A. Photosynthesis
- B. Respiration releasing heat
- C. Absorption of light
- D. Nitrogen fixation
4. Which does NOT explain why energy transfer between trophic levels is inefficient?
- A. Some biomass is not eaten
- B. Some food is lost as faeces
- C. Energy is lost in excretion
- D. Energy is created in respiration
5. Why is NPP the energy available to the next trophic level?
- A. It is the energy fixed in photosynthesis
- B. It is the energy stored in biomass after losses in respiration
- C. It is the energy of the light reaching the plant
- D. It is the energy lost as heat