plumiGPP, NPP and respiration: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 5.2.1 GPP, NPP and respiration, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(a)
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All 18 questions on GPP, NPP and respiration, as a list
- January 2025, Unit 4, Q1(a) (1 mark): Which row of the table identifies the box that represents net primary productivity (NPP), the box that represents gross primary productivity (GPP) and the box t
- January 2025, Unit 4, Q1(b) (1 mark): Which are suitable units for NPP? (1) A kJ m yr–1 B kJ m–1 yr–2 C kJ m–2 yr2 D kJ m–2 yr–1
- January 2025, Unit 4, Q1(c)(i) (1 mark): The biomass was distributed 34% to the leaves, 37% to the roots and the rest to the wood of the trees. Calculate how many units of biomass were distributed to t
- January 2025, Unit 4, Q1(c)(ii) (1 mark): Which row of the table shows what can be found in the biomass of leaves and roots of trees? (1) Leaves Roots A chlorophyll and starch chlorophyll and protein B
- June 2023, Unit 4, Q5(b) (3 marks): These scientists also measured the mass of C. pyrenoidosa, with and without PBF attached, after a 20-day period. They found that the increase in mass of C. pyre
- June 2022, Unit 4, Q5(a)(i) (1 mark): Which are the units for the energy content of these organisms? (1) A kJ m–1 year–1 B kJ m–1 year–2 C kJ m–2 year–1 D kJ m–2 year–2
- June 2022, Unit 4, Q5(a)(ii) (1 mark): The energy content of the tree is the net primary productivity (NPP). What is the relationship between NPP, gross primary productivity (GPP) and respiration (R)
- October 2021, Unit 4, Q8(a) (1 mark): State the meaning of the term biomass. (1)
- October 2021, Unit 4, Q8(b)(i) (2 marks): Calculate the percentage of biomass in organisms belonging to the domain Eukarya. Use the information in diagram A. (2) Answer %
- October 2021, Unit 4, Q8(b)(ii) (2 marks): Suggest why the scientists studied the distribution of biomass in groups of organisms and not the number of individual organisms. Use the information in diagram
- October 2021, Unit 4, Q8(c) (6 marks): The same study also determined the distribution of biomass in three different environments: marine, deep underground and land. The Voronoi diagram shows the dis
- June 2021, Unit 4, Q7(b)(i) (3 marks): Describe the conclusions that can be drawn from this graph. (3)
- June 2021, Unit 4, Q7(b)(ii) (4 marks): Explain how the products of the light-independent reactions become NPP below the ground. (4)
- June 2021, Unit 6, Q2(b)(i) (1 mark): State the meaning of the term biomass. (1)
- June 2021, Unit 6, Q2(b)(ii) (2 marks): When burnt, switchgrass biomass releases 14.25 MJ kg–1 of energy. Calculate the energy released from burning all the Kanlow biomass produced in year four. Give
- January 2020, Unit 4, Q1(a) (1 mark): Complete the diagram by writing the appropriate word or words in box A and in box B. (1)
- January 2020, Unit 4, Q1(b)(ii) (1 mark): Which of the following are the units for NPP? (1) A kg m–1 yr–1 B kg m–2 yr–2 C kJ m–1 yr–1 D kJ m–2 yr–1
- January 2020, Unit 4, Q1(b)(iii) (2 marks): In this forest, the total NPP was 11 700 units. The leaves contained 34% of the NPP and the wood contained 39% of the NPP. Calculate the NPP content in the root
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