Energy transfer and nutrient recycling Quiz
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5 questions, one answer each
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1. A producer has a GPP of 15 000 and plant respiration of 6 000 kJ m⁻² year⁻¹. What is the NPP?
- A. 21 000
- B. 2 500
- C. 9 000
- D. 6 000
2. Which is NOT a way energy is lost between trophic levels?
- A. Destruction of energy
- B. Respiration
- C. Faeces
- D. Parts not eaten
3. Producers contain 20 000 kJ and primary consumers 1 800 kJ. What is the efficiency of transfer?
- A. 11%
- B. 18%
- C. 90%
- D. 9%
4. What is the role of saprobionts?
- A. They fix nitrogen gas into ammonia
- B. They secrete enzymes onto dead matter and absorb the products, releasing nutrients
- C. They photosynthesise
- D. They convert nitrate to nitrogen gas
5. Why is decay slow in a waterlogged, acidic bog?
- A. Too much oxygen
- B. Too many plants
- C. Too many herbivores
- D. Low oxygen and low enzyme activity