Biomass and productivity Quiz
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5 questions, one answer each
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1. A plant has GPP 15 000 kJ m⁻² year⁻¹ and respiratory loss 6 000 kJ m⁻² year⁻¹. What is its NPP?
- A. 21 000 kJ m⁻² year⁻¹
- B. 6 000 kJ m⁻² year⁻¹
- C. 2.5 kJ m⁻² year⁻¹
- D. 9 000 kJ m⁻² year⁻¹
2. Which is the best unit for primary productivity?
- A. kJ ha⁻¹ year⁻¹
- B. kJ
- C. g
- D. kJ g⁻¹
3. Why is fresh mass an unreliable measure of biomass?
- A. It is too small to weigh
- B. The water content varies between samples
- C. It excludes carbon
- D. It includes only the roots
4. In calorimetry, 50 g of water rises by 10 °C (c = 4.2 J g⁻¹ °C⁻¹). What energy is transferred?
- A. 210 J
- B. 500 J
- C. 2100 J
- D. 5.0 J
5. What happens to most of the sugar a plant makes?
- A. It is stored as cellulose
- B. It is used as a respiratory substrate
- C. It is lost in faeces
- D. It is passed to decomposers directly