plumiEfficiency of energy transfer: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 5.2.2 Efficiency of energy transfer, 2019–2025, with mark schemes and examiner’s reports where available.
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Q1(a)
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All 11 questions on Efficiency of energy transfer, as a list
- October 2024, Unit 4, Q1(a) (2 marks): Suggest two reasons why very little of the light energy is absorbed by plants. (2)
- October 2024, Unit 4, Q1(b)(i) (1 mark): Only one fifteenth of this light energy was converted into plant biomass. Calculate the number of kilocalories of light energy converted into plant biomass. Giv
- October 2024, Unit 4, Q1(b)(ii) (1 mark): Only 6 kilocalories became animal biomass. Calculate the number of kilojoules (kJ) of energy that became biomass. 1 kilocalorie = 4.2 kJ. Give your answer to tw
- October 2024, Unit 4, Q1(b)(iii) (1 mark): In another field 154 000 kilocalories of energy was converted into plant biomass. Only 25 kilocalories of this energy was passed onto the highest trophic level
- June 2024, Unit 5, Q5(a) (1 mark): In one investigation, scientists looked at the accumulation of the neurotoxin BMAA in the food chain of the Chamorro people. The table shows some of the data. T
- October 2023, Unit 4, Q8(a)(i) (2 marks): Calculate the net primary productivity (NPP) as a percentage of the gross primary productivity (GPP) in this food chain. (2) Answer %
- October 2023, Unit 4, Q8(a)(ii) (3 marks): Complete the right-hand side of the diagram by adding: • arrows • the missing information in the box. (3)
- October 2023, Unit 4, Q8(b) (3 marks): Some animals eat a diet of meat and plant material. These animals can be given a trophic level number (TLN) based on a scale of 1 to 5. Animals that eat only pl
- June 2022, Unit 4, Q5(a)(iii) (1 mark): Calculate the ratio of the energy contents shown in these trophic levels: trophic level 1 : trophic level 2 : trophic level 3 (1) Answer
- June 2022, Unit 4, Q5(a)(iv) (2 marks): Explain why there is no fourth trophic level in this food chain. (2)
- June 2021, Unit 4, Q3(b) (1 mark): Calculate the efficiency of energy transfer between trophic level one and trophic level two. (1) Answer %
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