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 25 000 kJ m⁻² year⁻¹ and plant respiration releases 9 000 kJ m⁻² year⁻¹. What is its NPP?
- A. 34 000
- B. 9 000
- C. 16 000
- D. 25 000
2. Which is the energy available to primary consumers?
- A. Gross primary productivity
- B. Net primary productivity
- C. Energy lost in plant respiration
- D. Energy absorbed as light
3. Rabbits receive 3 000 kJ m⁻² year⁻¹ from a producer level with an NPP of 20 000 kJ m⁻² year⁻¹. What is the efficiency of transfer?
- A. 15%
- B. 6.7%
- C. 85%
- D. 0.15%
4. Which does NOT explain why energy is lost between trophic levels?
- A. Energy is released as heat in respiration
- B. Some material is egested as faeces
- C. Energy is destroyed as it passes along the food chain
- D. Some parts of the organism are not eaten
5. A cow takes in 20 000 kJ, loses 6 000 kJ in faeces and 11 000 kJ in respiration and excretion. How much energy is stored as new biomass?
- A. 3 000 kJ
- B. 9 000 kJ
- C. 14 000 kJ
- D. 17 000 kJ